Question: : Suppose that battery lives are normally distributed with a mean of 13.9 hours and a standard deviation of 1.9 hours. What is the minimum

: Suppose that battery lives are normally distributed with a mean of 13.9 hours and a standard deviation of 1.9 hours. What is the minimum sample size that would be required so that the probability of obtaining a sample mean below 12.2 is less than 2.5%?

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