Scores on a certain placement examination are normally distributed with a mean of 540 and a standard deviation of 80. Use the Central Limit Theorem to find the probability that a random sample of 20 scores has a mean greater than 580.

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A: given data, n=159X¯=32.4s=6.9CI=0.95α=1-0.95=0.05

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Q: Suppose that a random variable X has PDF defined by fx(x): = a(1+x) a(1-x) 0 if −1 b] = / P[X ≤ b].

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