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Thirty percent of the time, a machine puts 50 white

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Thirty percent of the time, a machine puts 50 white, 25 red, and 25 green jelly beans in a bag. The rest of the time, the same machine puts 30 white, 30 red, and 40 green jelly beans in a bag, The probability that a randomly chosen jelly bean from a randomly chosen bag is green is 0.28.

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The expert examines thirty percent of the time for white, red and green jelly beans in a bag.

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