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A manufacturer of power tools claims that the mean amount of time required to assemble their top-of-the-line table saw is 80 minutes with a standard

A manufacturer of power tools claims that the mean amount of time required to assemble their top-of-the-line table saw is 80 minutes with a standard deviation of 40 minutes. Suppose a random sample of 50 of this table saw is taken.

What is the probability that the sample mean will be between 77 and 89 minutes ?

(USE 4 DECIMALS)

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