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

question 8

Multiple Choice

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

• A) mean: 2.25; standard deviation: .76
• B) mean: 1.50; standard deviation: .87
• C) mean: 2.25; standard deviation: .87
• D) mean: 1.50; standard deviation: .76

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