AnswersNC-Math 4Discrete Random Variables – Mean

Discrete Random Variables – Mean Answers

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If a couple has 3 children, there are 8 possible outcomes for the number of boys and girls. Let X = the number of girls. Calculate and interpret the standard deviation of the distribution. Use 1.5 for μX.

Question illustration
A
The number of girls among the 3 children will typically vary from the mean by 0.25.
B
The number of girls among the 3 children will typically vary from the mean by 0.125.
C
The number of girls among the 3 children will typically vary from the mean by 0.75.
D
The number of girls among the 3 children will typically vary from the mean by 0.866.
9

Select the best description of the shape of the distribution and the relationship between the mean and the median.

Question illustration
A
skewed left, mean < median
B
symmetric, mean = median
C
roughly symmetric, mean ≈ median
D
skewed right, mean > median

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