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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?

a. 1.7928

b. 3.3586

c. 8.6056

d. 15

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