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 MuX.

A 3-column table with 4 rows. Column 1 is labeled outcome with entries BBB, (GBB, BGB, BBG), (BGG, GBG, GGB), GGG. Column 2 is labeled x with entries 0, 1, 2, 3. Column 3 is labeled P (x) with entries one-eighth, three-eighths, three-eighths, one-eighth.

The number of girls among the 3 children will typically vary from the mean by 0.25.
The number of girls among the 3 children will typically vary from the mean by 0.125.
The number of girls among the 3 children will typically vary from the mean by 0.75.
The number of girls among the 3 children will typically vary from the mean by 0.866.