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Mathematics, 03.11.2020 14:00 oliviaboils

The lifespan of a machine is normally distributed with a mean of 18.2 years and a standard deviation of 1.7 years. The manufacturer will replace a machine if it breaks before the guarantee period is over. If the manufacturer is willing to replace no more than 5% of the machines, find the length of time the manufacturer should set for the guarantee PLSS I NEED AN ANSWER FAST !!

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