A school is sending 12 children to a camp. If 20% of the children in the school
are first graders, and the 12 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 12 children to a camp. If 20% of the children in the school
are first graders, and the 12 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 12 Children to a Camp