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Posted on May 28, 2024

The lifetime of a new battery used in a digital clock has a mean of 250 days and a standard deviation of 21 days.

The lifetime of a new battery used in a digital clock has a mean of 250 days and a standard deviation of 21 days. What is the probability that the mean time of 49 randomly selected batteries is between 255 days and 260 days? Round your answer to four decimal places.

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