In a certain country, the true probability of a baby being a boy is 0.528. among the next four randomly selected births in the country, what is the probability that at least one of them is a girl ?

Here are the two methods you can perform this question : Method 1:

Probability that they are boys: 0.528 (4 squared) = 0.0777205Probability that 1 is a girl: 1 - 0.0777205 = 0.9222795 = 92.22%

Method 2:n=4p (boys) = 0.5281-o. 528 = 0.9222795 = 92.22%