A school is sending 17 children to a camp. If 20% 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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The Answer of A school is sending 17 children to a camp. If 20% 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?

A School Is Sending 17 Children to a Camp