1. Best Electronics offers a “no hassle” returns policy. The number of items ret

ID: 3058771 • Letter: 1

Question

1. Best Electronics offers a “no hassle” returns policy. The number of items returned per day follows the normal distribution. The mean number of customer returns is 9.1 per day and the standard deviation is 2.05 per day. Refer to the table in Appendix B.1.

In what percentage of the days between 12 and 14 customers returning items? (Round z-score computation to 2 decimal places and the final answer to 2 decimal places.)

(Click to select)

1. No, it is not possible.

2. Yes

3. Yes, but very unlikely.

2. Customers experiencing technical difficulty with their Internet cable hookup may call an 800 number for technical support. It takes the technician between 132 seconds to 13.4 minutes to resolve the problem. The distribution of this support time follows the uniform distribution.

What are the values for a and b in minutes? (Do not round the intermediate calculations. Round the final answers to 1 decimal place.)

What is the mean time to resolve the problem? (Do not round the intermediate calculations. Round the final answer to 2 decimal places.)

What is the standard deviation of the time? (Do not round the intermediate calculations. Round the final answer to 2 decimal places.)

What fraction of the problems take more than 5 minutes to resolve? (Do not round the intermediate calculations. Round the final answer to 2 decimal places.)

Suppose we wish to find the middle 50% of the problem-solving times. What are the end points of these two times? (Do not round the intermediate calculations. Round the final answers to 3 decimal places.)

Explanation / Answer