3. 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? Hint: Binomial

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A: K=3 N= 21

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Q: 4 What is the Variance of Vendor A? 4 3.75 3.36 4.08

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