Q1. The mean life of a pair of shoes is 40 months with a standard deviation of 8 months. If the life of the shoes is normally distributed, how many pairs of shoes out of one million will need replacement before 36 months?

A value between 808,500 and 809,500

A value between 190,000 and 192,000

A value between 308,500 and 309,000

None of the above.

Q2. A person's telephone number is an example of a (n) ____________ variable:

Nominative

Ordinal

Interval

None of the above

Q3. Suppose that the waiting time for a pizza to be ready at a local pizzeria has been found to be normally distributed with a mean of 15 minutes and a standard deviation of 7 minutes. Suppose that in an effort to provide better service to the customers, the manager has decided to provide discounts to those individuals whose waiting time exceeds a predetermined time. The manager decides that 15% of the customers should receive this discount. What is the number of minutes they need to wait to receive the discount?

About 22 minutes

About 26 minutes

About 28 minutes

About 30 minutes

None of the above