The quality control manager at a computer manufacturing company believes that the mean life of a...

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The quality control manager at a computer manufacturing company believes that the mean life of a...

The quality control manager at a computer manufacturing company believes that the mean life of a computer is 120 months, with a standard deviation of 10 months.

If he is correct, what is the probability that the mean of a sample of 90 computers would be less than 117.13 months? Round your answer to four decimal places.

math Statistics-And-Probability

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