Answer:
0.2, 0.6, 0.8, 0.35, 3/4, 1/4, 1/3, 1/2
Case Questions: Please answer these two questions, A1 and A2. Please use relevant examples from this case in your responses to these questions where possible. Use approximately 300 words for each question. Please use appropriate theory to support your answers and use APA referencing to cite academic material used. The APA referencing is not included in the word count.
A1. Identify two (2) significant issues that International Industries are facing from the information in the case study.
a) Explain why these are issues.
b) What would you recommend the organisation to do to address the two (2) issues which you identified.
These issues are the lack of technological innovation and the increasing competition in the global market. Addressing these issues is crucial for the organization's sustainability and growth.
The lack of technological innovation is an issue because it hinders International Industries from staying competitive and meeting changing market demands.
Without innovation, the organization may fall behind in terms of product development, process efficiency, and customer satisfaction.
To address this issue, the organization should prioritize research and development efforts, invest in new technologies, and foster a culture of innovation. This can involve collaborating with external partners, conducting market research, and providing training and incentives to employees.
The increasing competition in the global market is another significant issue. With globalization, companies from different countries are entering the market, creating intense competition for International Industries. This can impact market share, pricing, and profitability.
To tackle this issue, the organization should focus on strategic positioning and differentiation. This can be achieved through product diversification, expanding into new markets, improving marketing strategies, and enhancing customer relationships.
Additionally, the organization should constantly monitor and analyze the competitive landscape to identify opportunities and adapt accordingly.
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A. reclaim the land C. sell the gold On the left is an active gold mine. By law, what must the gold mining company do before they complete their mining operations on this land? B. clean their machines D. fill the mine with water
By law, the gold mining company before they complete their mining operations on this land must sell the gold.
The correct answer choice is option C
What must the gold mining company does?Since the gold mining company is licenced under the law and also in active operations, they must sell sell the gold mined.
The company has the legal rights to sell the gold they have mined on the mining site without any form of hindrance from anyone. The
Hence, the gold mining company should sell the gold
Complete question:
On the left is an active gold mine. By law, what must the gold mining company do before they complete their mining operations on this land? A. reclaim the land B. clean their machines C. sell the gold D. fill the mine with water.
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Write an equation of a line that has a slope of -1/2 in each form
I’m stuck, can anyone help?
Answer:
y=-1/2x+17
Step-by-step explanation:
y=-1/2x+17
Which of the following numbers are solutions to -2x-3≤11
a: -7 b: -10 c: 7 d: 10 e: -4
A) c,d,e
B) a,c,d,e
C) a,b
D) none
The numbers that are solutions to -2x - 3 ≤ 11 are (b) a, c, d and e
How to determine which of the numbers are solutions to -2x - 3 ≤ 11?The inequality expression is given as
-2x - 3 ≤ 11
Add 3 to both sides of the inequality
So, we have:
-2x ≤ 14
Divide through the inequality by -2
So, we have
x ≥ - 7
The above means that all numbers from -7 (inclusive) are in the solution
Hence, the numbers that are solutions to -2x - 3 ≤ 11 are (b) a, c, d and e
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Find the rate of change for each set of ordered pairs. What is
the average rate of change of all the sets?
(2,3.5), (6,5.5)
(-1,0), (0, 3)
(3,-3), (4,4)
Write your answer to the average rate of change as a fraction,
a/b.
Enter the answer
SCRATCHPAD
Check it
Improve this question
The rate of change for each set of ordered pairs is:
a. 1/2
b. 3
c. 7
How to Find the Average Rate of Change?The average rate of change = change in y / change in x.
Average rate of change for (2,3.5), (6,5.5):
Average rate of change = (5.5 - 3.5)/(6 - 2) = 2/4 = 1/2
Average rate of change for (-1,0), (0, 3):
Average rate of change = (3 - 0)/(0 - (-1)) = 3/1 = 3
Average rate of change for (3,-3), (4,4):
Average rate of change = (4 -(-3))/(4 - 3) = 7/1 = 7
Therefore, the rate of change for each set of ordered pairs is:
a. 1/2
b. 3
c. 7
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increase 320g in a ratio 5:2
Answer:5/2/320=900
Step-by-step explanation:
You want to know the percentage of utility companies that earned revenue less than 3939 million or more than 6161 million dollars. If the mean revenue was 5050 million dollars and the data has a standard deviation of 77 million, find the percentage. Assume that the distribution is normal. Round your answer to the nearest hundredth.
The percentage of utility companies that earned revenue less than 3939 million or more than 6161 million dollars is 0.1484 or 14.84% (rounded to the nearest hundredth).
We can use the standard normal distribution to find the percentage of utility companies that earned revenue less than 3939 million or more than 6161 million dollars.
First, we need to standardize the values using the formula:
z = (x - μ) / σ
where x is the revenue value, μ is the mean revenue, and σ is the standard deviation.
For x = 3939 million:
z = (3939 - 5050) / 77 = -1.45
For x = 6161 million:
z = (6161 - 5050) / 77 = 1.44
Using a standard normal distribution table or calculator, we can find the probability of a value being less than -1.45 or greater than 1.44.
P(z < -1.45) = 0.0735
P(z > 1.44) = 0.0749
The percentage of utility companies that earned revenue less than 3939 million or more than 6161 million dollars is:
0.0735 + 0.0749 = 0.1484 or 14.84% (rounded to the nearest hundredth).
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B. Using audit sampling, a subset of the population is selected for testing to derive generalisations about the population. Required: Determine FIVE (5) elements to be assessed during the sample selection. (5 marks )
The five elements to be assessed during sample selection in audit sampling are Sapmlinf Frame, Sample Size, Sampling Method, Sampling Interval, Sampling Risk.
1. Sampling Frame: The sampling frame is the list or source from which the sample will be selected. It is important to ensure that the sampling frame represents the entire population accurately and includes all relevant elements.
2. Sample Size: Determining the appropriate sample size is crucial to ensure the sample is representative of the population and provides sufficient evidence for drawing conclusions. Factors such as desired confidence level, acceptable level of risk, and variability within the population influence the determination of the sample size.
3. Sampling Method: There are various sampling methods available, including random sampling, stratified sampling, and systematic sampling. The chosen sampling method should be appropriate for the objectives of the audit and the characteristics of the population.
4. Sampling Interval: In certain sampling methods, such as systematic sampling, a sampling interval is used to select elements from the population. The sampling interval is determined by dividing the population size by the desired sample size and helps ensure randomization in the selection process.
5. Sampling Risk: Sampling risk refers to the risk that the conclusions drawn from the sample may not be representative of the entire population. It is important to assess and control sampling risk by considering factors such as the desired level of confidence, allowable risk of incorrect conclusions, and the precision required in the audit results.
During the sample selection process, auditors need to carefully consider these elements to ensure that the selected sample accurately represents the population and provides reliable results. By assessing and addressing these elements, auditors can enhance the effectiveness and efficiency of the audit sampling process, allowing for meaningful generalizations about the population.
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4x + 2y = 18 solve for y
Find the vector parametrization r(t) of the line L that passes through the points (1,3,1) and (3,8,4). (Give your answer in the form ⟨∗,∗,∗⟩. Express numbers in exact form. Use symbolic notation and fractions where needed.) Let r 1
(t)=⟨−3,−14,10⟩+t(0,−1,2⟩ and r 2
(s)=⟨−15,−10,−1⟩+s⟨−4,0;−1⟩. Find the point of intersection. P. of the two lines r 1
and r 2
.
Therefore, the point of intersection of the two lines r1 and r2 is P(⟨-3, -10, 2⟩).
To find the vector parametrization of the line L that passes through the points (1, 3, 1) and (3, 8, 4), we can use the two-point form.
Let's denote the parameter t and find the direction vector of the line:
Direction vector d = (3, 8, 4) - (1, 3, 1) = (2, 5, 3)
Now, we can write the vector parametrization of the line L:
r(t) = (1, 3, 1) + t(2, 5, 3)
Simplifying:
r(t) = (1 + 2t, 3 + 5t, 1 + 3t)
Therefore, the vector parametrization of the line L is r(t) = ⟨1 + 2t, 3 + 5t, 1 + 3t⟩.
Now, let's find the point of intersection of the two lines r1(t) and r2(s).
Given:
r1(t) = ⟨-3, -14, 10⟩ + t⟨0, -1, 2⟩
r2(s) = ⟨-15, -10, -1⟩ + s⟨-4, 0, -1⟩
To find the point of intersection, we need to equate the x, y, and z components of the two parametric equations:
x1 + t * 0 = x2 + s * (-4)
y1 + t * (-1) = y2 + s * 0
z1 + t * 2 = z2 + s * (-1)
Solving these equations will give us the values of t and s at the point of intersection.
From the first equation:
-3 = -15 - 4s
Simplifying:
4s = 12
s = 3
Substituting s = 3 into the second equation:
-14 - t = -10
Simplifying:
t = -4
Now we can substitute the values of t and s into either of the parametric equations to find the point of intersection.
Substituting t = -4 into r1(t):
r1(-4) = ⟨-3, -14, 10⟩ + (-4)⟨0, -1, 2⟩
= ⟨-3, -14, 10⟩ + ⟨0, 4, -8⟩
= ⟨-3, -10, 2⟩
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Consider the given vector equation. r(t) = 4 sin(t)i – 2 cos(t)j (a) Find r'(t). 4 cos(t)i + 2 sin(t); (b) Sketch the plane curve together with position vector r(t) and the tangent vector r(t) for the given value of t = 37/4.
(a) The sketch of the plane curve with the given vector equation is illustrated below.
(b) The resulting picture is a curve in the xy-plane with the position vector r(37/4) and the tangent vector r'(37/4) at that point.
(c) The sketch of the position vector r(t) and the tangent vector r'(t) for the given value of t is illustrated below.
To find r'(t), we need to take the derivative of r(t) with respect to t. Since the coefficients of i and j are functions of t, we need to use the chain rule. The result is r'(t) = 4 cos(t)i + 2 sin(t)j. This vector represents the tangent vector to the curve at the point r(t) for any given value of t.
Now, let's sketch the curve together with the position vector r(t) and the tangent vector r'(t) for t = 37/4.
To do this, we can plot the point (4sin(37/4), -2cos(37/4)) on the xy-plane and draw a vector from the origin to this point, which represents r(37/4). We can also draw a tangent vector to the curve at this point, which represents r'(37/4).
Since
=> r'(37/4) = 4cos(37/4)i + 2sin(37/4)j,
we can plot this vector starting at the point r(37/4) and extending in the direction of the vector.
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Complete Question:
Consider the vector equation r ( t ) = 4 sin t i − 2 cos t j , t = 3 π / 4 .
(a) Sketch the plane curve with the given vector equation.
(b) Find r'(t).
(c) Sketch the position vector r(t) and the tangent vector r'(t) for the given value of t.
Ten is at least the product of a number h and 5.
Answer:
Ten is at least the product of a number h and 5. h = 2
Step-by-step explanation:
Divide 10 by 5 and you get 2.
Check; 5 x 2 = 10
Solve the augmented matrix by elementary row operations. 9. (4 points) Let A and B be 3 by 3 matrices with det (A) = 3 and det (b) = 5. Find the value of det (AB).
The value of determinant of the matrix det (AB) is 15.
Given matrices A and B are 3 by 3 matrices with
det (A) = 3 and
det (b) = 5.
We need to find the value of det (AB).
Writing the given matrices into the augmented matrix form gives [A | I] and [B | I] respectively.
By multiplying A and B, we get AB. Similarly, by multiplying I and I, we get I. We can then write AB into an augmented matrix form as [AB | I].
Therefore, we can solve the augmented matrix [AB | I] by row reducing [A | I] and [B | I] simultaneously using elementary row operations as shown below.

The determinant of AB can be calculated as det(AB) = det(A) × det(B)
= 3 × 5
= 15.
Conclusion: The value of det (AB) is 15.
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We need to find the value of determinant det(AB), using the formula: det(AB) = det(A)det(B)
=> det(AB) = 3 × 5
=> det(AB) = 15.
Hence, the value of det(AB) is 15.
The given matrices are A and B. Here, we need to determine the value of det(AB). To calculate the determinant of the product of two matrices, we can follow this rule:
det(AB) = det(A)det(B).
Given that: det(A) = 3
det(B) = 5
Now, let C = AB be the matrix product. Then,
det(C) = det(AB).
To evaluate det(C), we have to compute C first. We can use the following method to solve the augmented matrix by elementary row operations.
Given matrices A and B are: Matrix A and B:
[A|B] = [3 0 0|1 0 1] [0 3 0|0 1 1] [0 0 3|1 1 0][A|B]
= [3 0 0|1 0 1] [0 3 0|0 1 1] [0 0 3|1 1 0].
We can see that the coefficient matrix is an identity matrix. So, we can directly evaluate the determinant of A to be 3.
det(A) = 3.
Therefore, det(AB) = det(A)det(B)
= 3 × 5
= 15.
Conclusion: Therefore, the value of det(AB) is 15.
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Which equation does the graph of the systems of equations solve?
two linear functions intersecting at 2, 2
−one halfx + 3 = 3x − 4
−one halfx − 3 = −3x + 4
one halfx + 3 = 3x + 4
one halfx + 3 = −3x − 4
Option C : The equation that represents the system of linear equations with a solution at point (2, 2) is one half x + 3 = 3x + 4.
To find the equation of the system of equations that has a solution of (2, 2), we need to substitute x = 2 and y = 2 into each of the given equations and see which one satisfies the equations.
Substituting x = 2 and y = 2 into each of the linear equations gives:
-1/2(2) + 3 = 3(2) - 4 => 2 ≠ 8
This equation is not satisfied at (2,2).
-1/2(2) - 3 = -3(2) + 4 => -4 ≠ -10
This equation is not satisfied at (2,2).
1/2(2) + 3 = 3(2) + 4 => 5 = 10
This equation is satisfied at (2,2).
1/2(2) + 3 = -3(2) - 4 => 5 = -10
This equation is not satisfied at (2,2).
Thus, the only equation that satisfies the system of equations at point (2,2) is one half x + 3 = 3x + 4.
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Which equation does the graph of the systems of equations solve?
two linear functions intersecting at 2, 2
A. −one half x + 3 = 3x − 4
B. −one half x − 3 = −3x + 4
C. one half x + 3 = 3x + 4
D. one half x + 3 = −3x − 4
Joseph built a model of a pyramid where the base of the pyramid is a square. If the base has an area of 49 cm2 (squared), what is the side length of the base?
Answer:
7 cm
Step-by-step explanation:
We are told that the pyramid has a square base of an area of 49 cm².
Therefore, the side length of the base of the pyramid is still the same as the side length of a square having an area of 49 cm².
Area of a square = s², where s is the side length of the square.
The side length of the base can be gotten using the following equation,
\( s^2 = 49 \)
Solve for s by looking for the share root of both sides.
\( \sqrt{s^2} = \sqrt{49} \)
\( s = 7 \)
The side length of the base = 7 cm
The area of the triangle shown is represented by A=s(s−21)(s−17)(s−10)−−−−−−−−−−−−−−−−−−−−√, where s is equal to half the perimeter. What is the height h of the triangle?
Answer:
9.88 units
Step-by-step explanation:
We are given that area of triangle is given by
\(A=\sqrt{s(s-21)(s-17)(s-10)}\)
s=Half perimeter
By comparing with
\(A=\sqrt{s(s-a)(s-b)(s-c)}\)
We get
a=21
b=17
c=10
\(s=\frac{a+b+c}{2}=\frac{21+17+10}{2}=24\)
Now, the area
\(A=\sqrt{24(24-21)(24-17)(24-10)}\)
A=84
Area of triangle, \(A=\frac{1}{2}\times bh\)
b=17
\(84=\frac{1}{2}(17)(h)\)
\(h=\frac{84\times 2}{17}\)
\(h=9.88 units\)
Hence, the height of the triangle=9.88 units
Are the following statements true or false?
1. The set {0} forms a basis for the zero subspace.
2. Let m>n Then U= {u1,u2,â¦,um} in Rn can form a basis for Rn if the correct mân vectors are removed from U.
3. The nullity of a matrix A is the same as the dimension of the subspace spanned be the columns of A.
4. If {u1,u2,u3} is a basis for R3, then span {u1,u2} is a plane.
5. Rn has exactly one subspace of dimension m for each of m=0,1,2,â¦,n.
True: Rn has exactly one subspace of dimension m for each of m = 0, 1, 2, ..., n. This is because the dimension of a subspace can range from 0 (the zero subspace) to n (the entire space Rn), and there is exactly one subspace for each possible dimension within this range.
The nullity of a matrix A is the same as the dimension of the subspace spanned by the columns of A, (4) If {u1, u2, u3} is a basis for R3, then span{u1, u2} is a plane, (5) Rn has exactly one subspace of dimension m for each of m = 0, 1, 2, ..., n?True: The set {0} forms a basis for the zero subspace since it satisfies the conditions for a basis. It is linearly independent and spans the zero vector.
False: If m > n, then U = {u1, u2, ..., um} in Rn cannot form a basis for Rn by removing m - n vectors. To form a basis for Rn, the number of vectors in the basis must be equal to the dimension of Rn, which is n.
True: The nullity of a matrix A is equal to the dimension of the subspace spanned by the columns of A. This is known as the Rank-Nullity Theorem, which states that the nullity of a matrix plus the rank of the matrix equals the number of columns in the matrix.
True: If {u1, u2, u3} is a basis for R3, then span{u1, u2} is a plane since it is a two-dimensional subspace within R3. It is spanned by u1 and u2, which are linearly independent vectors.
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In a particular chi-square goodness-of-fit test, there are six categories and 325 observations. Use the 0.10 significance level.
How many degrees of freedom are there?
What is the critical value of chi-square? (Round your answer to 3 decimal places.)
In this particular chi-square goodness-of-fit test with six categories, 325 observations, and a 0.10 significance level, there are 5 degrees of freedom and the critical value of chi-square is 9.236.
To find chi-square goodness-of-fit test question.
To determine the degrees of freedom in this particular chi-square goodness-of-fit test with six categories and 325 observations, you need to subtract 1 from the number of categories. So, the degrees of freedom are:
Degrees of Freedom (df) = Number of Categories - 1
Degrees of Freedom (df) = 6 - 1
Degrees of Freedom (df) = 5
Next, to find the critical value of chi-square at a 0.10 significance level and 5 degrees of freedom, you can use a chi-square distribution table or an online calculator. After consulting the table or calculator, you will find that the critical value of chi-square is:
Critical Value of Chi-Square (rounded to 3 decimal places) = 9.236
So, in this particular chi-square goodness-of-fit test with six categories, 325 observations, and a 0.10 significance level, there are 5 degrees of freedom and the critical value of chi-square is 9.236.
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solve this problem 8x + 4(x-1)
a. 32x+3
b. 12x-4
c. 12x+4
d. 9x-4
Answer:
b
Step-by-step explanation:
8x +4(x -1)
Expand by multiplying 4 into each term inside the bracket:
= 8x +4(x) +4(-1)
= 8x +4x -4
Simplify
= 12x -4
Thus, the answer is b.
8x + 4(x-1)
Let's start of by applying the distributive property
8x + 4x - 4
Next, let's add the variables.
12x - 4
The answer would be option B.
Hope this helps!
Help me please, asap
Answer:
k = \(\frac{1}{3}\)
Step-by-step explanation:
X| 1 2 5 10 30
Y| 3 6 15 30 90
Una caja de ahorros ofrece a sus clientes un interés simple del 8% anual por una imposición de 18.000 € durante 5 años. ¿ Cual es el importe de los intereses
generados en ese tiempo €
Una caja de ahorros ofrece a sus clientes un interés simple del 8% anual por una imposición de 18.000 € durante 5 años. de los Interés es = 7,200 €
Interés = Principal × Tasa de interés × Tiempo
Dado que el principal es de 18.000 €, la tasa de interés es del 8% anual y el tiempo es de 5 años, podemos sustituir estos valores en la fórmula:
Interés = 18,000 € × 0.08 × 5
Interés = 7,200 €
Por lo tanto, el importe de los intereses generados en ese tiempo es de 7.200 €. Esto significa que al finalizar los 5 años, el cliente habrá obtenido 7.200 € adicionales como resultado de la imposición de 18.000 € con una tasa de interés del 8% anual. Es importante tener en cuenta que este cálculo se basa en la suposición de que el interés es simple y no se acumula ni se reinvierte.
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what is arc length calculus formula?
Arc length formula is L = ∫a^b √[1 + (dy/dx)^2] dx . The arc length of a curve is the length of the curve between two points, and it can be calculated using the arc length formula in calculus.
The arc length formula can be used to find the length of a curve in terms of the function that describes the curve.
The arc length formula is given by:
L = ∫a^b √[1 + (dy/dx)^2] dx
where L is the arc length of the curve, a and b are the endpoints of the curve, dy/dx is the derivative of the function that describes the curve with respect to x, and ∫ represents the integral of the function over the interval from a to b.
To use the formula, we first find the derivative of the function that describes the curve, dy/dx. Then we plug this expression into the arc length formula and integrate the expression over the interval from a to b to find the arc length of the curve.
The arc length formula is useful in many applications, such as physics, engineering, and geometry, and it allows us to find the length of a curve even when it is not a straight line.
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A spherical hot-air balloon has a diameter of 55 feet. When the balloon is inflated, the radius increases at a rate of 1.5 feet per minute. Approximately how long does it take to inflate the balloon to Two-thirds of its maximum volume? Use π = 3.14 and V = four-thirds pi r cubed.
Answer:
The time it would take to inflate the balloon to approximately two-thirds of its maximum volume is approximately 46.90 minutes
Step-by-step explanation:
The given parameters are;
The diameter of the balloon = 55 feet
The rate of increase of the radius of the balloon when inflated = 1.5 feet per minute
We have;
dr/dt = 1.5 feet per minute = 1.5 ft/min
V = 4/3·π·r³
The maximum volume of the balloon = 4/3 × 3.14 × 55³ = 696556.67 ft³
When the volume is two-thirds the maximum volume, we have;
2/3 × 696556.67 ft³ = 464371.11 ft³
The value of the radius, r₂ at that point is found as follows;
4/3·π·r₂³ = 464371.11 ft³
r₂³ = 464371.11 ft³ × 3/4 = 348278.33 ft³
348278.333333
r₂ = ∛(348278.33 ft³) ≈ 70.36 ft
The time for the radius to increase to the above length = Length/(Rate of increase of length of the radius)
The time for the radius to increase to the above length ≈ 70.369 ft/(1.5 ft/min) ≈ 46.90 minutes
The time it would take to inflate the balloon to approximately two-thirds of its maximum volume ≈ 46.90 minutes.
-25 - 30 + 2 = pls help
Answer:
7
Step-by-step explanation:
Do addition first, so 30 plus 2, and then subtract, 32 minus 25. It is seven.
This is a dot plot of the number of text messages sent in a day by a sample of students at a local high school. The sample consisted of 30 students and was selected as representative of the population.
a. What do the six values of 0 on the dot plot represent?
b. Since the sample is representative of the population, describe what you think the dot plot of the entire population will look like.
The six values of 0 shown on the dot plot represent that 6 students out of the 30 sampled did not send any text messages daily.
With the sample being representative of the population, a dot plot for the entire population would have the same proportions as the sample but with a larger number of students.
What does the dot plot show?The number of dots above a number indicates the number of students who send that number of text messages daily.
As there are 6 dots over 0, it means that 6 students do not send any text messages daily.
Seeing as the sample is representative of the entire population, a dot plot for the whole school would have a larger number of dots over each number but the proportions would be the same as the sample.
For instance, the proportion of total students who don't send any messages per day is:
= 6 / 30
= 20%
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I will mark you brainliest !!!!
Answer:
how can you mato someone brainlI
est
the first garden is 4 feet long. Deja is using small bricks, which are each 1/3 of a foot long. How many small bricks are needed?
To build a garden of 4 feet Deja needs 12 small bricks.
What is a unitary method?A unitary method is a mathematical way of obtaining the value of a single unit and then deriving any no. of given units by multiplying it with the single unit.
Given, The first garden is 4 feet long the bricks Deja is using are each 1/3 of a foot long.
Therefore, the number of bricks required is,
= 4/(1/3).
= 4×(3/1).
= 12 bricks.
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A hot air balloon holds 1,592 cubic meters of helium. the density of helium is 0.1785 kilograms per cubic meter. how many kilograms of helium does the balloon contain, rounded to the nearest tenth of a kilogram? 432.3 kg 284.2 kg 2,043.7 kg 5,435.3 kg
By taking the product between density and volume we will see that the mass is 284.2 kg
How to find the mass of helium?Remember that density is the quotient between mass and volume, then:
mass = density*volume.
Here we know that:
volume = 1,592 m³density = 0.1785 kg/m³Taking the product of these two we get:
mass = (1,592 m³)*(0.1785 kg/m³) = 284.2 kg
So the correct option is the second one.
If you want to learn more about density.
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Answer:
284.2 kg my good sir
Step-by-step explanation:
Big brain
What is the coordinate of the midpoint in the segment
shown?
Answer:
(2.5, -1)
Step-by-step explanation:
The midpoint of a line segment is just the average position of the 2 endpoints.
(x1, y1) = (1, 2)
(x2, y2) = (4, -4)
Find the average x-coordinate by adding them up and dividing by 2:
\(\frac{1+4}{2}=\frac{5}{2}=2.5\)
Do the same for the y-coordinate:
\(\frac{2-4}{2}=\frac{-2}{2}=-1\)
Using those, the coordinate of the midpoint is (2.5, -1)
Problem 2:
The lifespan of a particular brand of light bulb follows a normal distribution with a mean of 1000 hours and a standard deviation of 50 hours.
Find:
a) the z-score of light bulb with a mean of 500 hours.
b) If a customer buys 20 of these light bulbs, what is the probability that the average lifespan of these bulbs will be less than 980 hours?
c) the probability of light bulbs with the mean of 400 hours.
d) the number of light bulbs with the mean less than 1000 hours
The answers are:
a) The z-score for a light bulb that lasts 500 hours is -10.
b) For a sample of 20 light bulbs, the probability that the average lifespan will be less than 980 hours is approximately 0.0367, or 3.67%.
c) The z-score for a light bulb that lasts 400 hours is -12. This is even more unusual than a lifespan of 500 hours.
d) Given the lifespan follows a normal distribution with a mean of 1000 hours, 50% of the light bulbs will have a lifespan less than 1000 hours.
How to solve the problema) The z-score is calculated as:
z = (X - μ) / σ
Where X is the data point, μ is the mean, and σ is the standard deviation. Here, X = 500 hours, μ = 1000 hours, and σ = 50 hours. So,
z = (500 - 1000) / 50 = -10.
The z-score for a bulb that lasts 500 hours is -10. This is far from the mean, indicating that a bulb lasting only 500 hours is very unusual for this brand of bulbs.
b) If a customer buys 20 of these light bulbs, we're now interested in the average lifespan of these bulbs. . In this case, n = 20, so the standard error is
50/√20
≈ 11.18 hours.
z = (980 - 1000) / 11.18 ≈ -1.79.
The probability that z is less than -1.79 is approximately 0.0367, or 3.67%.
c) The z-score for a bulb with a lifespan of 400 hours can be calculated as:
z = (400 - 1000) / 50 = -12.
The probability associated with z = -12 is virtually zero. So the probability of getting a bulb with a mean lifespan of 400 hours is virtually zero.
d) The mean lifespan is 1000 hours, so half of the light bulbs will have a lifespan less than 1000 hours. Since the lifespan follows a normal distribution, the mean, median, and mode are the same. So, 50% of light bulbs will have a lifespan less than 1000 hours.
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