A Couple Plans to Have Children Until They Get a Boy,but

Multiple Choice

A couple plans to have children until they get a boy,but they agree that they will not have more than four children even if all are girls.Find the standard deviation of the number of children the couple have.Assume that boys and girls are equally likely.Round your answer to three decimal places.

A) 1.109
B) 0.992
C) 1.053
D) 0.984
E) 1.173