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What is the probability of the sample mean lifetime

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Probability and Sample Mean

Q: The lifetime of a certain brand of batteries are known to be normally distributed with a mean of 1600 hours and a standard deviation of 400 hours. A random sample of 64 of these batteries is taken. What is the probability that the sample mean lifetime is more than 1500 hours?

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Basic Statistics: What is the probability of the sample mean lifetime

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