Asked by Scarlett Garcia

The life span of a calculator manufactured by the Intel Corporation has a normal distribution with a mean of 54 months and a standard deviation of 8 months. The company guarantees that any calculator that starts malfunctioning within 36 months of the purchase will be replaced by a new one. What is the probability that a randomly selected calculator will be replaced by a new one?

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Answered by Damon
http://davidmlane.com/hyperstat/z_table.html
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