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IV. (10 points) Score Three children are selected at random from a group of five boys and three girls. (1)What's the probability that all three

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IV. (10 points) Score Three children are selected at random from a group of five boys and three girls. (1)What's the probability that all three are boys? (2) What's the probability at least two girls are selected? V. (10 points) Score If X has probability density function f(x)= 1- OSX-3), P(-1EX

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