Short Answer
LongLast Inc. produces car batteries. The mean life of these batteries is 60 months. The distribution of the battery life closely follows the normal probability distribution with a standard deviation of 8 months. As a part of its testing program, LongLast tests a sample of 25 batteries. What proportion of the samples will have a mean useful life less than 56 months?
Correct Answer:
Verified
Correct Answer:
Verified
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