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A nursery sells trees of different types and heights. These trees average 50 inches in height with a standard deviation of 15 inches. Suppose that

A nursery sells trees of different types and heights. These trees average 50 inches in height with a standard deviation of 15 inches. Suppose that 70 pine trees are sold for planting at City Hall. What is the standard deviation for the sample mean? 15 1.7928 8.6056 3.3586

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