Question: Please help with this problem: Suppose that battery lives are normally distributed with a mean of 11.85 hours and a standard deviation of 1.93 hours.What

Please help with this problem:

Suppose that battery lives are normally distributed with a mean of 11.85 hours and a standard deviation of 1.93 hours.What is the minimum sample size that would be required so that the probability of obtaining a sample mean below 11.27 is less than 2.5%?

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