A large company buys four such printers what is the


The time until first failure of a brand of ink jet printers is normally distributed with a mean of 1500 hours and a standard deviation of 160 hours. A large company buys four such printers. What is the probability that the mean lifetime of the four printers is more than 1568 hours?

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Basic Statistics: A large company buys four such printers what is the
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