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(1 point) X 18 19 20 21 22 F(x) 21 7 9 3 Let x be the ages of students in a class. Given the

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(1 point) X 18 19 20 21 22 F(x) 21 7 9 3 Let x be the ages of students in a class. Given the frequency distribution F(x) above, determine the following probabilities: (a) P(x = 20) = (b) P(x 2 19) = (c) P(x

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