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The monthly salaries of 400 graduates of a college are normally distributed with standard deviation $1 500. 2.5% of the graduates have monthly salaries

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The monthly salaries of 400 graduates of a college are normally distributed with standard deviation $1 500. 2.5% of the graduates have monthly salaries higher than $13 000. (a) Find the mean of the monthly salaries of the 400 graduates. (b) Find the number of graduates with monthly salaries between $8 500 and $13 000.

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