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A nursery sells trees of different types and heights. These trees average 40 inches in height...

A nursery sells trees of different types and heights. These trees average 40 inches in height with a standard deviation of 12 inches. Suppose that 80 pine trees are sold for planting at City Hall. What is the standard deviation for the sample mean?

(a) 1.3416

(b) 2.9074

(c) 8.1544

(d) 12

math   Statistics-And-Probability   
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