A pizzeria owner wants to know which pizza topping is least liked by her customers so she can take it off the menu. She used four different methods to find this information.
Method 1: The owner asked every third customer to rate all the pizza toppings in order of preference.
Method 2: The owner gave all customers a toll-free telephone number and asked them to phone in their topping preferences.
Method 3: The owner asked the preferences of every other teenager who entered the pizzeria.
Method 4: The owner reviewed the pizzeria’s complaint cards and assessed all complaints related to pizza toppings.
Which method is most likely to give a valid generalization

Answers

Answer 1
I suggest method 1 because it is unbiased and systematic.  
The second method requires a lot on the initiatives of customers, and likely to have extreme cases only (liked very much or disliked very much).  
The third is biased towards teenagers, which may not be the only category of customers who ordered pizzas.
Again, the fourth requires initiative from the customer, so biased towards customers who had something to say.


Answer 2

The valid method is the owner asked every third customer to rate all the pizza toppings in order of preference. The correct option is A.

What is feedback?

information that is utilized as a foundation for improvement, such as data on how people react to a product or how well someone performs a task.

I suggest method 1 because it is unbiased and systematic.  The second method requires a lot of the initiative of customers and is likely to have extreme cases only (liked very much or disliked very much).  

The third is biased towards teenagers, which may not be the only category of customers who ordered pizzas. Again, the fourth requires initiative from the customer, so biased towards customers who had something to say.

Therefore, the valid method is for the owner to ask every third customer to rate all the pizza toppings in order of preference. The correct option is A.

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Related Questions

Convert 85°to radians

Answers

1 degree = 0.0174533 radians

85* 0.0174533 = 1.4835305 radians

Round answer as needed

Answer:

17pi/36 (PLATO answer)

Step-by-step explanation:

Verify that the divergence theorem is true for the vector field f on the region
e. give the flux. f(x, y, z) = 3xi + xyj + 4xzk, e is the cube bounded by the planes x = 0, x = 3, y = 0, y = 3, z = 0, and z = 3.

Answers

[tex]\mathbf f(x,y,z)=3x\,\mathbf i+xy\,\mathbf j+4xz\,\mathbf k[/tex]
[tex]\implies\nabla\cdot\mathbf f(x,y,z)=3+x+4x=3+5x[/tex]

[tex]\displaystyle\iint_{\partial E}\mathbf f(x,y,z)\,\mathrm dS=\iiint_E\nabla\cdot\mathbf f(x,y,z)\,\mathrm dV[/tex]
[tex]=\displaystyle\int_{z=0}^{z=3}\int_{y=0}^{y=3}\int_{x=0}^{x=3}(3+5x)\,\mathrm dx\,\mathrm dy\,\mathrm dz[/tex]
[tex]=\displaystyle9\int_0^3(3+5x)\,\mathrm dx[/tex]
[tex]=\dfrac{567}2[/tex]
Final answer:

To verify the divergence theorem, we need to calculate the flux of the vector field through the surface of the cube and compare it with the divergence of the vector field integrated over the volume of the cube.

Explanation:

To verify the divergence theorem for the given vector field f(x, y, z) = 3xi + xyj + 4xzk on the region e, which is a cube bounded by the planes x = 0, x = 3, y = 0, y = 3, z = 0, and z = 3, we need to calculate the flux of the vector field through the surface of the cube and compare it with the divergence of the vector field integrated over the volume of the cube.

The flux, Ƭ, can be calculated using the surface integral of the vector field over each face of the cube. According to the divergence theorem, this should be equal to the volume integral of the divergence of the vector field over the entire volume of the cube.

By calculating both sides of the equation, we can verify that the divergence theorem holds true for the given vector field on the specified region.

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Evaluate x 1 - x -1 + x 0 for x = 2
a) 0
b)1/2
c)1 1/2
d)2 1/2

Answers

To solve, substitute the values of x with 2.
(2)^1 - (2) - 1 + 2^0 = 0.
The answer would be a)

The solution of expression is, 7/2.

What is an expression?

A mathematical expression is a group of numerical variables and functions that have been combined using operations like addition, subtraction, multiplication, and division.

We have to give that,

An expression is,

⇒ x¹ + x⁻¹ + x⁰

Now, Substitute x = 2 in the above expression and find the value,

⇒ x¹ + x⁻¹ + x⁰

⇒ 2¹ + 2⁻¹ + 2⁰

⇒ 2 + 1/2 + 1

⇒ 3 + 1/2

⇒ (6 + 1)/2

⇒ 7/2

Therefore, The solution is, 7/2

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An employee earned $3,300 working for an employer in the current year. the current rate for fica social security is 6.2% payable on earnings up to $117,000 maximum per year and the rate for fica medicare 1.45%. the employer's total fica payroll tax for this employee is:

Answers

Employer's Total FICA Tax = $3,300 * (0.062 + 0.0145) = $252.45

The value of the given digits in the numbers 7s in 775 823 159

Answers

Theh are 770 or 770 million

Graph y=3x^2 -5 and it's inverse

Answers

Answer:

The graph in the attached figure

Step-by-step explanation:

we have

[tex]y=3x^{2}-5[/tex] -----> quadratic equation of a vertical parabola open upward

Find the inverse function

Exchange variables x for y and y for x

[tex]x=3y^{2}-5[/tex]

Isolate the variable y

[tex]3y^{2}=x+5[/tex]  -----> inverse function (horizontal parabola open to the right)

or

[tex]y=(+/-)\sqrt{\frac{x+5}{3}}[/tex]

using a graphing tool

see the attached figure


The graph of function and it's inverse of the graph is shown in image.

We have to given that,

To graph the function y = 3x² - 5 and it's inverse.

Here, The equation is,

y = 3x² - 5

So, We can find it's inverse as,

y = 3x² - 5

y + 5 = 3x²

(y + 5) / 3 = x²

x² = (y + 5)/3

x = √(y + 5)/3

Hence, the inverse of function is,

f ⁻¹ (x) = √ (x + 5)/3

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A manufacturing machine has a 10% defect rate. if 4 items are chosen at random, what is the probability that at least one will have a defect?

Answers

Final answer:

The probability that at least one of the four randomly chosen items will be defective is 34.39%. This is calculated by subtracting the probability that all items are not defective from 1.

Explanation:

The subject of the question relates to the field of Probability. This problem pertains to the concept known as 'probability of at least one' event. In this case, we are considering the probability that at least one item will have a defect.

To calculate this, it's easier to find the probability that none of the items have a defect and then subtract that from 1. Since the machine has a 10% defect rate, it means there's a 90% chance that any item chosen will NOT be defective. If we choose 4 items, the probability that all are good is 0.9 * 0.9 * 0.9 * 0.9 = 0.6561.

So, the probability that at least one defective item will be chosen is 1 - 0.6561 = 0.3439 or 34.39%.

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Rewrite the expression x^2-12x as a(x-h)^2+k

Answers

[tex]x^2-12x=x^2-12x+36-36=(x-6)^2-36[/tex]

A person in a casino decides to play blackjack until he loses a game, but he will not play more than 3 games. let l denote a loss and w denote a win. what is the sample space for this random experiment

Answers

Final answer:

The sample space for the random experiment of playing blackjack until a loss or a maximum of three games are played is represented by the set {l, wl, ww}.

Explanation:

The sample space for this scenario comprises of all possible outcomes of playing "blackjack" until the person loses or has played three games. We represent win and loss by w and l respectively. By these definitions, we get the following possibilities: l (losing on the first game), wl (winning the first game then losing the second), and ww (winning the first two games and decide not to play a third game or it wasn't possible to play a third game). This assumes that the player stops after either losing a game or after playing the third game, even if he won that.

Note that the scenario where the player wins all three games (www) is not included in the sample space because the problem states that the player will stop playing as soon as they lose a game.

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Which of the following shows 2.1851 rounded to the nearest tenth?

A. 2.1
B.2.185
C.2.19
D.2.2

Answers

The tenth is the first number immediately after the decimal point.
In this case, it is 1. Because there is an 8 after, and 8 > 5, you would round up, leaving you with 2.2.

D is the correct answer. Hope this helps!

The ticket sales for Fist Bump are as follows:

On Monday 1 /7 of the tickets are sold
On Tuesday 1/3 of the tickets are sold
On Wednesday 2/7 of the tickets are sold

What fraction of tickets was sold by Thursday?

Answers

Notice that the denominators are 3 and 7, which are factors of 21.

So express all the fractions with denominator 21:

On Monday [tex] \frac{1}{7} = \frac{1}{7} * \frac{3}{3} = \frac{3}{21} [/tex] are sold
On Tuesday [tex] \frac{1}{3} = \frac{1}{3} * \frac{7}{7} = \frac{7}{21} [/tex] are sold
On Wednesday [tex] \frac{2}{7} = \frac{2}{7} * \frac{3}{3} = \frac{6}{21} [/tex] are sold


by Thursday [tex]\frac{3}{21}+\frac{7}{21}+\frac{6}{21} = \frac{3+7+6}{21}= \frac{16}{21} [/tex] of the tickets was sold.


Answer: [tex]\frac{16}{21}[/tex]

Final answer:

To calculate the total fraction of tickets sold for the movie Fist Bump by Thursday, we find the least common denominator for the fractions (21), convert each fraction, and then sum them up to get 16/21 of the tickets sold.

Explanation:

The question is asking how much of the tickets were sold by Thursday for the movie Fist Bump. To find the total fraction of tickets sold from Monday to Wednesday, we need to add up the fractions:

Monday: 1/7 of the ticketsTuesday: 1/3 of the ticketsWednesday: 2/7 of the tickets

First, let's find a common denominator for the fractions. The least common multiple of 7 and 3 is 21, so we'll convert all fractions to have a denominator of 21:

1/7 = 3/211/3 = 7/212/7 = 6/21

Now we can add the fractions:

3/21 + 7/21 + 6/21 = 16/21

Therefore, by Thursday, a total of 16/21 of the tickets have been sold.

Pentagon RSTUV is circumscribed about a circle. What is the value of x if RS = 6, ST = 9, TU = 7, UV = 15, and VR = 14?

Answers

Starting at vertex V going until vertex S, we make our calculations.

VR = 14

Rx = x

therefore, xS = VR – Rx

xS = 14 – x                           ---> 1

 

Now starting at vertex V going left to vertex S, we make our next set of calculations. Assuming x is on VR but nearer R

VR  = 14 - x

at UV = 15 – (14 – x)

at UV = 1 + x

at TU = 7 – (1 + x)

at TU = 6 – x

at ST = 9 – (6 – x)

at ST = 3 + x                        ---> 2


Equate 1 and 2:

14 – x = 3 + x

2 x = 11

x = 5.5

To find the value of x in the circumscribed pentagon RSTUV with given sides, we set up an equation based on the sum of the lengths of the opposite sides. After solving the equation, we determined that x is 25.

Pentagon RSTUV and the Value of x

Given that pentagon RSTUV is circumscribed about a circle, we need to find the value of x,

where RS = 6, ST = 9, TU = 7, UV = 15, and VR = 14.

For a polygon circumscribed about a circle, the sum of the lengths of the pairs of opposite sides must be equal. Therefore, we can set up the equation:

RS + TU + x = ST + UV + VR

Substituting the given values:

6 + 7 + x = 9 + 15 + 14

Simplifying the right-hand side:

6 + 7 + x = 3813 + x = 38x = 38 - 13x = 25

Thus, the value of x is 25.

Which number produces an irrational number when multiplied by 0.4?

Answers

5 x 0.4 = 2 and [tex] \sqrt{2} [/tex] = 1.4142....... which is an irrational number

Indicate in standard form the equation of the line through the given points.

P(0, -4), Q(5, 1)

Answers

[tex]\bf \begin{array}{lllll} &x_1&y_1&x_2&y_2\\ % (a,b) &({{ 0}}\quad ,&{{ -4}})\quad % (c,d) &({{ 5}}\quad ,&{{ 1}}) \end{array} \\\\\\ % slope = m slope = {{ m}}= \cfrac{rise}{run} \implies \cfrac{{{ y_2}}-{{ y_1}}}{{{ x_2}}-{{ x_1}}}\implies \cfrac{1-(-4)}{5-0}\implies \cfrac{1+4}{5}\implies 1[/tex]

[tex]\bf y-{{ y_1}}={{ m}}(x-{{ x_1}})\implies y-(-4)=1(x-0)\implies y+4=x\\ \left. \qquad \right. \uparrow\\ \textit{point-slope form}[/tex]

now, the so-called standard form, is moving the variables to the left-hand-side, sort them  in descending order according to their exponents, and usually alphabetically some, so the "x" is left of the "y" and so on

-x+y=-4

there is a cafe at the park it is 13 meters long and 8 meters wide. what is the area of the cafe

Answers

13*8=104

The answer should be 104 meters cubed

lim θ→π/4 1 - tan θ / sin θ - cos θ

Answers

substitute the value of the variable into the expression and simplify, its theta arrow-to-the-right, pi/4 times 1-tan theta/sin theta - cos theta (i cant type the signs on computer, sorry

Ahmed is working at the burger joint. His boss pays him $6.50 per hour and promises a raise of $0.25 per hour every 6 months. Which sequence describes Ahmed's expected hourly wages in dollars, starting with his current wage?

Answers

$6.50,$6.75,$7.00,$7.25,$7.50,$7.75+

Answer:

Sequence will be $6.50, $6.75, $7.0, $7.25.......

Step-by-step explanation:

Ahmed is working at the burger joint and he was paid by his boss $6.50 per hour.

His boss promised him to raise $0.25 per hour every six months.

So we have to find the sequence which describes Ahmed's expected hourly wages starting with his current wage.

As at every 6 months increase in wages is $0.25 so the sequence formed will be an arithmetic sequence with common difference of 0.25 and first term 6.50

Sequence will be $6.50, $6.75, $7.0, $7.25,.........

arman needs 4 1/2 inches of cable to make A,3 3/4 inches to make B, and 5 1/8 inches to make C. He used a 12 inch piece of cable to make A and B.

Answers

4 1/2 + 3 3/4 = 4 2/4 + 3 3/4 = 7 5/4 = 8 1/4...what he needs for A and B

He used 12 inches of cable...
12 - 8 1/4 = 11 4/4 - 8 1/4 = 3 3/4....length left after A and B are made

he doesn't have enough to make the last one...
5 1/8 - 3 3/4 = 41/8 - 15/4 = 41/8 - 30/8 = 11/8 = 1 3/8....he is short by 1 3/8 inches

Answer:

8 1/4

Step-by-step explanation:

Given m || n, find X....PLEASE HELP ASAP....SOS...SUCK AT MATH PLEASE HELP ME!!

Answers

The angles with measurements equal to 3x+3 and 2x+22 should add up to 180°. This is because the angle which measures 2x+22 and the angle that is adjacent to the angle measuring 3x+3 are supposed to be congruent. If we mathematically translate the concept above, this can be expressed as,
        3x + 3 + 2x + 22 = 180

Combining like terms,
      (3x + 2x) + (3 + 22) = 180
Simplifying,
      5x + 25 = 180

Transpose the constants to only one side of the equation,
    5x = 155
Divide the equation by 5.
    x = 31

ANSWER: x = 31

A maintenance man has 12 keys on his key ring. if he tries the keys at random on a storage room door, discarding those that do not work, what is the probability that he will get the door open on his 4th try?

Answers

P(Failure on first try) = 11/12
P(Failure on second try) = 10/11
P(Failure on third try)= 9/10
P(success on fourth try) = 1/9

P(success exactly on fourth try) = 11/12*10/11*9/10*1/9 = 1/12

Final answer:

The probability that the maintenance man will open the storage door on his fourth try with 12 keys is 1/12.

Explanation:

The question asks for the probability that the maintenance man will open a storage room door on his fourth try with 12 unique keys at his disposal. This is a classic probability problem that involves permutations.

To solve this, we consider the scenario as a sequence of independent events. He has 1 out of 12 chances to pick the correct key on the first try, 1 out of 11 on the second try (after discarding the first incorrect key), 1 out of 10 on the third try, and so on. However, we want the first three attempts to be unsuccessful and the fourth to be successful.

Thus, the probability that the first three keys are incorrect is (11/12) * (10/11) * (9/10), and the probability the fourth key is correct is 1/9. The overall probability of the desired outcome is the product of these probabilities, which simplifies to:

(11/12) * (10/11) * (9/10) * (1/9) = 1/12.

Use the position equation
s = −16t^2 + v0t + s0
as the model for the problem.

A cargo plane flying at 6000 feet over level terrain drops a 700-pound supply package.

(a) How long will it take the package to strike the ground? (Round your answer to two decimal places.)
(b) The plane is flying at 600 miles per hour. How far will the package travel horizontally during its descent? (Round your answer to two decimal places.)

Answers

A. To solve for the time it takes for the package to strike the ground, all we have to do is to plug in the given values in to the position equation:

s = −16 t^2 + v0 t + s0

Where,

s = distance of the plane from the ground = - 6000 ft       (negative since the package moves from top to bottom)

t = time for it to strike the ground = unknown

v0 = 0 since the package starts from rest

s0 = 0 since we take the plane as the reference point

Substituting the given values:

- 6000 = -16 t^2 + 0 * t + 0

16 t^2 = 6000

t^2 = 375

t = 19.36 s

 

B. s = v * t

where v = 600 miles / hr = 0.17 miles / s

s = (0.17 miles / s) * 19.36 s

s = 3.23 miles = 17,054 ft

If one calendar year had two consecutive months with Friday the thirteenth, which months would they be?

Answers

In a regular, nonleap year, February, March, and November will all start on the same day. If they started on a Sunday, then the 13th would fall on a Friday. So in that case, the answer would be February and March.

In a leap year, no 2 months in a row would have that.

BE is the midsegment of triangle ACD. The value of x is:


5.
20.
35.
40.

Answers

The midsegment theorem says that the midsegment is half the third side and parallel as well. 20*2 is 40 so x = 35

P(1+r)t Using the expression above, choose the correct answers for the new balance and the amount of interest earned in the following compound interest problem. $950 at 7% for 8 years, compounded annually. Total Amount = $ Interest Amount = $

Answers

The formula is:
Future value = accumulated amount, F = P(1+r)^t
P=principal
r=annual interest rate [compounded annually]
t=number of years of loan
 
Given: 
P=950
r=0.07
t=8

F=950(1.07)^8
= 1632.28 (total amount)

Interest = total amount - principal
=1632.28 - 950
=682.28

Final answer:

The new balance after 8 years with an initial $950 at a 7% annual interest rate compounded annually is $1632.77, and the amount of interest earned is $682.77.

Explanation:

The compounded interest formula is P(1+r)^t, where P is the principal amount, r is the annual interest rate (in decimal form), and t is the time in years. To find the new balance and amount of interest earned for $950 at 7% for 8 years, compounded annually, we use the formula with P = $950, r = 0.07 (7% as a decimal), and t = 8.

First, we calculate the new balance:

Total Amount = $950(1 + 0.07)^8

Total Amount = $950(1.07)^8

Total Amount = $950 * 1.718186

Total Amount = $1632.77 (rounded to two decimal places)

Subsequently, to find the amount of interest earned, we subtract the original principal from the total amount:

Interest Amount = Total Amount - Original Principal

Interest Amount = $1632.77 - $950

Interest Amount = $682.77

Therefore, the new balance after 8 years is $1632.77, and the interest earned is $682.77.

how to prove a polygon is a rectangle?

Answers

If 2 pairs of sides are parallel and the angles are congruent then the polygon is a rectangle.

Harland just got his second major credit card, so his credit score rose from 671 to 711. According to the following table for a $150,000 mortgage, how much less per year would Harland have to pay on a $150,000 mortgage with the new credit score?

Answers

Answer:

2004

Step-by-step explanation:

The spoke of a wheel reaches from the center of the wheel to its rim. If the circumference of the rim of the wheel is 42 inches, how long is each spoke? Round your answer to the nearest hundredth.

Answers

check the picture below.  round it away.

the circle is centered at the origin and the length of its radius is 4. what is
the circles equation

Answers

Answer: [tex]x^2+y^2=16[/tex]

Step-by-step explanation:

The general equation of a circle having center at (h,k) and radius r is given by :-

[tex](x-h)^2+(y-k)^2=r^2[/tex]

Given: Radius of the circle : r= 4 units

The center of the circle :  (h,k)=(0,0)

Now, the equation of a circle having center at (0,0) and radius 4 units is given by :-

[tex](x-0)^2+(y-0)^2=4^2\\\\\Rightarrow\ x^2+y^2=16[/tex]

Answer:

X²+Y²=16

Step-by-step explanation:

A p e x

EASY 5 POINTS!!!! A new park in the shape of a hexagon will have 66 sides of equal length. On a scale drawing, the coordinates of the vertices of the park are: (6.5,5)6.5,5, (18.5,0)18.5,0, (6.5,-5)6.5,-5,
(-6.5,-5)-6.5,-5, (-18.5,0)-18.5,0, and (-6.5,5)-6.5,5. How long is each side of the park?

Answers

To solve this problem, first we have to plot the vertices in a Cartesian plane to know the plot. This would also give us an idea of which points are adjacent or interconnected forming a hexagon.

The plot is shown below. Now we can see which points are adjacent to each other. Let us take points (-6.5, 5) and (6.5, 5) for our calculation.

The distance formula given two points is:

d^2 = (x2 – x1)^2 + (y^2 – y^1)^2

Now we calculate the distance between 2 points:

d^2 = (6.5 – (-6.5))^2 + (5 – 5)^2

d^2 = 169

d = 13

Therefore the length of each side of the park is 13 units.

 

Answer:

13 units

Final answer:

To find the length of each side of the hexagon, you can use the distance formula. The distance formula is derived from the Pythagorean theorem for finding the length of the hypotenuse of a right triangle. By following the steps outlined, you can determine the length of each side of the hexagon.

Explanation:

To find the length of each side of the hexagon, you can use the distance formula. The distance formula is derived from the Pythagorean theorem for finding the length of the hypotenuse of a right triangle. In this case, the coordinates of the vertices of the hexagon form a regular hexagon, meaning all sides are equal in length. Here's how you can find the length of one side:

Take the coordinates of two adjacent vertices of the hexagon.Use the distance formula, which is sqrt((x2 - x1)^2 + (y2 - y1)^2), where (x1, y1) and (x2, y2) are the coordinates of the two points.Plug in the coordinates and calculate the distance.Repeat the process for different pairs of adjacent vertices to make sure all sides have the same length.

By following these steps, you should be able to determine the length of each side of the hexagon.

Complete parts (a) and (b) using the probability distribution below.

The number of overtime hours worked in one week per employee

Overtime hours
0 1 2 3 4 5 6

Probability
0.026 0.072 0.154 0.303 0.215 0.164 0.066

(a) Find the mean, variance, and standard deviation of the probability distribution.

Find the mean of the probability distribution.

μ = 3.4

σ2 = 2.0

σ = 1.4
Choose the correct answer below.

A.
An employee works an average of 2.0 overtime hours per week with a standard deviation of approximately 1.4 hours.

B.
An employee works an average 3.4 of overtime hours per week with a standard deviation of approximately 4 hours.

C.
An employee works an average of 1.4 overtime hours per week with a standard deviation of approximately 3.4 hours.

D.
An employee works an average of 3.4 overtime hours per week with a standard deviation of approximately 1.4 hours.

Answers

μ = (0×0.026) + (1×0.072) +(2×0.152) + (3×0.303) + (4×0.215) + (5×0.164) + (6×0.066) 
μ = 0 + 0.072 + 0.304 + 0.909 + 0.86 + 0.82 + 0.396
μ = 3.361 ≈ 3.4

We need the value of ∑X² to work out the variance
∑X² = (0²×0.026) + (1²×0.072) + (2²×0.152) + (3²×0.303) + (4²×0.215) + (5²×0.164) + (6²×0.066)
∑X² = 0+0.072+0.608+2.727+3.44+4.1+2.376
∑X² = 13.323

Variance = ∑X² - μ²
Variance  = 13.323 - (3.4)² = 1.763 ≈ 2

Standard Deviation = √Variance = √1.8 = 1.3416... ≈ 1.4

The correct answer related to the value of mean and standard deviation is the option D

An employee works an average of 3.4 overtime hours per week with a standard deviation of approximately 1.4 hours.
Final answer:

The mean number of overtime hours worked is 3.4 with a standard deviation of approximately 1.4 hours, which corresponds to option D.

Explanation:

The correct answer for the given probability distribution of overtime hours worked per employee in one week is D. An employee works an average of 3.4 overtime hours per week with a standard deviation of approximately 1.4 hours.

To find the mean (μ) of the probability distribution, we multiply each possible value by its corresponding probability and then sum all these products. The mean of this distribution is given as 3.4, which is found by summing up the product of each value of overtime hours and its corresponding probability:

μ = (0 * 0.026) + (1 * 0.072) + (2 * 0.154) + (3 * 0.303) + (4 * 0.215) + (5 * 0.164) + (6 * 0.066) = 3.4

The variance (σ2) is calculated by taking each value's deviation from the mean, squaring it, multiplying by the probability, and summing all these values. The variance for this distribution is given as 2.0:

σ2 = Σ [(x - μ)2 * P(x)] = 2.0

And the standard deviation (σ) is simply the square root of the variance:

σ = √σ2 = 1.4

Other Questions
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