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In a class of 50 students, the number of students ni of

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In a class of 50 students, the number of students ni of each age i is shown in the following table: Age i ni 18 20 19 22

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In a class of 50 students, the number of students ni of each age i is shown in the following table: Age i ni 18 20 19 22 20 4 21 3 25 1 If a student is to be selected at random from the class, what is the expected value of his age?

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