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Please help.. A nursery sells trees of different types and heights. These trees average 40 inches in height with a standard deviation of 13 inches.

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A nursery sells trees of different types and heights. These trees average 40 inches in height with a standard deviation of 13 inches. Suppose that 90 pine trees are sold for planting at City Hall. What is the standard deviation for the sample mean? Multiple Choice O 1.3703 O 2.9361 O 8.1831 O 13

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