Question: 21. Finding Mean and Standard Deviation Let the random variable x represent the number of girls in a family of three children. Construct a table

21. Finding Mean and Standard Deviation Let the random variable x represent the number of girls in a family of three children. Construct a table describing the probability distribution, then find the mean and standard deviation. (Hint: List the different possible outcomes.) Is it unusual for a family of three children to consist of three girls?

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