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In a school there are four kindergarten classes, with 21, 24, 17 and 28 students. We...

In a school there are four kindergarten classes, with 21, 24,
17 and 28 students. We choose one of the 90 kindergarten students
randomly, and denote the number of students in her class by X. Find the
expectation and variance of X.

Math   Statistics-And-Probability   
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