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Estimate the probability that machines will last between 9 to 14 years; if the useful period of a machine is normally distributed with a mean

Estimate the probability that machines will last between 9 to 14 years; if the useful period of a machine is normally distributed with a mean of 10.5 years and a standard deviation of 1.9 years. [HINT: When we say a machine last nine years; we mean nine plus or minus one half of a year, so you need between 8.5 to 14.5 years]

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