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A class with 5 third graders and 15 fourth graders are lined up in a random order for recess. T is the random variable which

A class with 5 third graders and 15 fourth graders are lined up in a random order for recess. T is the random variable which is equal to the number of 3rd graders in the first 4 places of the line. What is the expected value of T? ET = EX: 1.23 +

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