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Historically, a part's length has been normally distributed with a mean of 4 inches and a standard deviation of 0.19 inches. Suppose that we take

Historically, a part's length has been normally distributed with a mean of 4 inches and a standard deviation of 0.19 inches. Suppose that we take samples of size 72 parts and find the sample mean of the length of the parts in the sample. What is the expected value of the sample mean?

Give your answer to 1 decimal place.

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