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What is the probability that the sample average

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Reference no: EM131699527

A mobile phone company is concerned about the lifetime of phone batteries supplied by a new supplier. Based on historical data this type of battery should last for 900 days with a standard deviation of 150 days. If a random sample of 40 batteries was selected, what is the probability that the sample average for the battery lifetime will be between 921 and 942 days.

Reference no: EM131699527

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