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

Question

Quizplus · Accepted Answer

The Answer of 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

Suppose That the Average Life of a Refrigerator Before Replacement μ\muμ

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