# Question: A certain brand of refrigerators has a length of life

A certain brand of refrigerators has a length of life that is normally distributed with a mean and a standard deviation of 15 years and 2 years, respectively. In addition to providing the answer, state the relevant Excel commands.

a. What is the probability a refrigerator will last less than 6.5 years?

b. What is the probability that a refrigerator will last more than 23 years?

c. What length of life should the retailer advertise for these refrigerators so that only 3% of the refrigerators fail before the advertised length of life?

a. What is the probability a refrigerator will last less than 6.5 years?

b. What is the probability that a refrigerator will last more than 23 years?

c. What length of life should the retailer advertise for these refrigerators so that only 3% of the refrigerators fail before the advertised length of life?

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