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A manufacturer knows that their items have a normally distributed length, with a mean of 7.3 inches, and standard deviation of 1.2 inches. If 15

A manufacturer knows that their items have a normally distributed length, with a mean of 7.3 inches, and standard deviation of 1.2 inches.

If 15 items are chosen at random, what is the probability that their mean length is less than 6.9 inches?

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