APFIVE Central Limit Theorem for a Skewed Population
The lifetime of a certain type of electronic component follows an exponential distribution with a mean of 5000 hours. For a random sample of size n = 25, which of the following best describes the sampling distribution of the sample mean?
A
Approximately normal only if the sample is large
B
Not approximately normal since n < 30
C
Exactly exponential with mean 5000 hours
D
Approximately normal with mean 5000 hours
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