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RoseWind [281]
2 years ago
6

Joe is a repair technician for a computer company. Each week he has a batch of computers that needs fixed. The number of compute

rs that he has left to fix at the end of each day can be estimated with the equation C = 18 - 7d , where C is the number of computers left and d is the number of days he has worked that week. What is the meaning of the value 18 in this equation?
a. Joe will complete the repairs within 18 days

b. Joe starts each week with 18 computer to fix

c. Joe repairs computers at a rate of 108 per day

d. Joe receives 18 new computers each day that need fixed.
Mathematics
1 answer:
mrs_skeptik [129]2 years ago
4 0

Answer:

D

Step-by-step explanation:

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Answer:

\hat{\sigma}^2 = 2.8  

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 138

Average = 32.6 inch

Population variance,

\sigma^2 = 2.8

We have to find a point estimate for the population variance of the height.

The point estimate for the population variance is the population variance itself.

\hat{\sigma}^2 = \sigma^2 = 2.8

Thus, the point estimate of population variance is the population variance that is 2.8.

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3 years ago
If they want a sample committee consisting of four male and four female students, from a possible volunteer pool of eight male a
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Answer:

There are 2450 ways.

Step-by-step explanation:

We can pick first the 4 man, and then the 4 women. The configuration of men and women are independant with each other, so the total of possibilities is obtained by multiplying the total possibilities to pick 4 men and the total possibilities of picking 4 women.

To pick 4 men from a group of 8, the total number of possibilities is the amount of ways to pick 4 elements from a group of 8. This number is represented by the combinatorial number of 8 with 4

{8 \choose 4} = \frac{8!}{4!4!} = 70

To pick 4 women from a group of 7, we need to count the total amount of ways to pick 4 elements from a group of 7. This is the combinatorial number of 8 with 7

{7 \choose 4} = \frac{7!}{4!3!} = 35

Hence, the total amount of ways to pick 4 men and 4 women from a group of 8 men and 7 women is 70*35 = 2450.

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2nd one is the answer

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