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What's the best way to solve this ? A dishwasher has a mean lifetime of 12 years with an estimated standard deviation of 1.27 years.

What's the best way to solve this ?

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A dishwasher has a mean lifetime of 12 years with an estimated standard deviation of 1.27 years. The lifetime of a dishwasher is normally distributed. Suppose you are a manufacturer and you take a sample of 11 dishwashers that you made. Find the probability that the sample would have a mean lifetime less than 9.68 years

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