What you’ll learn to do: understand and calculate binomial distributions

If a family has 4 children, what is the probability that the family will have exactly 2 boys? Would it be unusual to have 0 boys in a family of 4 children? To answer these questions, you need to understand what a Bernoulli trial is and how to calculate a binomial probability. Calculating the mean and standard deviation for this situation helps you to understand what is a typical value and what is an unusual value for the number of boys in a family with 4 children.