Suppose That the Average Life of a Refrigerator Before Replacement $\mu$

question 5

Multiple Choice

Suppose that the average life of a refrigerator before replacement is $\mu$ = 14 years with a (99.7% of data) range from 8 to 20 years. Let x = age at which a refrigerator is replaced. Assume that x has a distribution that is approximately normal. Find a good approximation for the standard deviation of x values.

• A)1 year
• B)2 years
• C)4 years
• D)6 years
• E)3 years

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