The Random Variable X Represents the Number of Girls in a Family

question 103

Multiple Choice

The random variable x represents the number of girls in a family of three children. Assuming that boys andgirls are equally likely, find the mean and standard deviation for the random variable x.

• A) mean: 1.50; standard deviation: 0.87
• B) mean: 2.25; standard deviation: 0.87
• C) mean: 1.50; standard deviation: 0.76
• D) mean: 2.25; standard deviation: 0.76

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