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To find P (68 ≤ ≤ 73), describe the distribution of sample means.

Suppose that x has distribution with μ = 72 and σ =8.

(a) If random samples of size n = 9 are selected, can we say anything about the distribution of sample means?

(b) If the original x distribution is normal, can we say anything about the distribution of random samples of size 16? Find P (68 ≤ ≤ 73).

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