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A dishwasher has a mean life of 12 years

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A dishwasher has a mean life of 12 years with an estimated standard
deviation of 1.25 years. The life of a dishwasher is normally distributed. Suppose you are a manufacturer and you take a sample of 10 dishwashers that you made. Can you help me find the mean of the sample mean and show the steps?

 
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