A gender-selection technique is designed to increasethe likelihood that a baby will be a girl. In the results of the gender-selection technique,841 births consisted of 422 baby girls and419 baby boys. In analyzing these results, assume that boys and girls are equally likely.

a. Find the probability of getting exactly 422 girls in 841 births.

b. Find the probability of getting422 or more girls in 841 births. If boys and girls are equally likely, isgirls inbirths unusually high?

c. Which probability is relevant for trying to determine whether the technique is effective: the result from part (a) or the result from part(b)?

d. Based on the results, does it appear that thegender-selection technique is effective?