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Please help Question 18 5 pts A manufacturer knows that their items have a normally distributed length, with a mean of 18.6 inches, and standard

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Question 18 5 pts A manufacturer knows that their items have a normally distributed length, with a mean of 18.6 inches, and standard deviation of 5.5 inches. If 15 items are chosen at random, what is the probability that their mean length is less than 21.9 inches? Round your answer to 4 decimal places. P(=

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