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Chapter 7: Q. 79 (page 434)

The average wait time is:

a. one hour.

b. two hours.

c. two and a half hours.

d. four hours.

Short Answer

Expert verified

The average wait time is two hours. Therefore, option "b" is the correct answer.

Step by step solution

01

Given information

From the information given in the question, we observed that the furniture company delivers furniture from 10. A. M to 2. PM continuously and uniformly. The company delivers furniture in 4 hours.

02

Explanation 

We can calculate the average waiting time of the company delivers furniture as follow:

=0+42

=2hours.

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Most popular questions from this chapter

Based on data from the National Health Survey, women between the ages of 18and 24have an average systolic blood pressures (in mm Hg) of 114.8with a standard deviation of 13.1. Systolic blood pressure for women between the ages of 18 to 24follow a normal distribution.
a. If one woman from this population is randomly selected, find the probability that her systolic blood pressure is greater than120 .
b. If 40 women from this population are randomly selected, find the probability that their mean systolic blood pressure is greater than 120 .
c. If the sample were four women between the ages of 18to 24 and we did not know the original distribution, could the central limit theorem be used?

The cost of unleaded gasoline in the Bay Area once followed an unknown distribution with a mean of \(4.59and a standard deviation of \)0.10. Sixteen gas stations from the Bay Area are randomly chosen. We are interested in the average cost of gasoline for the 16gas stations. The distribution to use for the average cost of gasoline for the 16gas stations is:

a.X¯~N(4.59,0.10)

b.X¯~N4.59,0.1016

c.X¯~N4.59,160.10

d.X¯~N4.59,160.10

Find the probability that the sums will fall between the z-scores –2 and 1.

A manufacturer produces 25-pound lifting weights. The lowest actual weight is 24pounds, and the highest is 26pounds. Each weight is equally likely so the distribution of weights is uniform. A sample of 100weights is taken.

Find the 90thpercentile for the mean weight for the 100 weights.

Determine which of the following are true and which are false. Then, in complete sentences, justify your answers.

a. When the sample size is large, the mean of X¯is approximately equal to the mean of X.

b. When the sample size is large, X¯is approximately normally distributed.

c. When the sample size is large, the standard deviation of X¯is approximately the same as the standard deviation of X.
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