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A school is sending 17 children to a camp. If 25% of the children in the school are first graders, and the 17 children are

A school is sending 17 children to a camp. If 25% of the children in the school are first graders, and the 17 children are selected at random from among all 6 grades at the school, find the mean and variance of the number of first graders chosen

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