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x 18 19 20 21 22 Fa) 20 9 5 4 4 Let x be the ages of students in a class. Given the frequency

x 18 19 20 21 22 Fa) 20 9 5 4 4 Let x be the ages of students in a class. Given the frequency distribution F(x) above, determine the following probabilities: (a) P(x = 18) = (b) P(18

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