Question

Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. This method is designed to increase the likelihood that each baby will be a​ girl, but assume that the method has no​ effect, so the probability of a girl is 0.5. Assume that the groups consist of 31 couples. Complete parts​ (a) through​ (c) below. a. Find the mean and the standard deviation for the numbers of girls in groups of 31 births. The value of the mean is mu

Answer 1

a)

mean = np
= 31 * 0.5
= 15.5

std.deviation = sqrt(npq)
= sqrt(31*0.5*0.5)
= 2.7839