refer to the accompanying table, which describes results form groups of 8 births from 8 different sets of parents. the random variable x represents the number of girls among 8 children. find the mean and standard deviation for the number of girls in 8 births.

number of girls x : 0, 1, 2, 3, 4, 5, 6, 7, 8

P(x): 0.003, 0.032, 0.117, 0.229, 0.249, 0.223, 0.111, 0.031, 0.005

the mean is = __ girl(s)

the standard deviation = __ girl(s)