assume that different groups 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 39 couples. complete parts A through C . Find the mean and the standard deviation for the numbers of girls in groups of 39 births . The value of the mean is = Type a interger or a decimal do not round