1. The problem statement, all variables and given/known data If there are 4 children in a family, find the probability of getting exactly 3 girls. Find the mean, variance, and standard deviation. Use two different methods(binomial distribution method and general probability distribution method). 2. Relevant equations Binomial distribution equations: Mean=np variance=npq standard deviation= sq. root of variance 3. The attempt at a solution mean= (4)(.75)=3 variance=(4)(.75)(.25)=.75 s.d.= .866 is that right?