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Please show your work. Depending upon the usage of the cell phone, the useful life of a cell phone is normally distributed with a mean

Please show your work.

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Depending upon the usage of the cell phone, the useful life of a cell phone is normally distributed with a mean of 24 months and a standard deviation of 4 months. You took a random sample of 25 cell phone users. What is the probability that the sample mean life would lie between 2.1 and 2.2 years

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