An airplane company makes airplanes with a mean life of 35 years and variance of 71 square years. The distribution of li

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An airplane company makes airplanes with a mean life of 35 years and variance of 71 square years. The distribution of li

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An airplane company makes airplanes with a mean life of 35 years
and variance of 71 square years. The distribution of lives is
normal.
What is the probability that an airplane will last between 30
and 48 years?
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