Customers experiencing technical difficulty with their internet cable hookup may call an 800 number for

technical support. It takes the technician between 90 seconds and 13 minutes to resolve the problem. The

distribution of this support time follows the uniform distribution.

a. What are the values for a and b in minutes? (Do not round your intermediate calculations. Round

your answers to 1 decimal place.)

5. Award: 10.00 points

a 1.5

b 13

b-1. What is the mean time to resolve the problem? (Do not round your intermediate calculations.

Round your answer to 2 decimal places.)

Mean

b-2. What is the standard deviation of the time? (Do not round your intermediate calculations. Round

your answer to 2 decimal places.)

Standard deviation

c. What percent of the problems take more than 5 minutes to resolve? (Do not round your intermediate

calculations. Round your answer to 2 decimal places.)

Percent %

d. 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 your intermediate calculations. Round your answers to 3 decimal

places.)

End point 1

End point 2