Short Answer
The usable lifetime of a particular type of battery is normally distributed with a mean of 1,100 days and a standard deviation of 80 days. The manufacturer randomly selects 400 batteries of this type and ships them to K-Mart.
What is the mean of the sampling distribution of 
?
______________
What is the standard deviation?
______________
What is the probability the average usable lifetime of these 400 batteries is between 1,097 and 1,104 days?
______________
Correct Answer:
Verified
Correct Answer:
Verified
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