AA Battery Lifetimes. A brand of AA battery has normally distributed lifetimes with a mean of 28.4
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AA Battery Lifetimes. A brand of AA battery has normally distributed lifetimes with a mean of 28.4 hours and a standard deviation of 2.6 hours. A supermarket purchases 500 of these batteries from the manufacturer. What is the probability that at least 75% of them will last longer than 26 hours?
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