The heights of 12-month-old boys are approximately normally distributed with a mean of 29.8 inches and a standard deviation of 1.2 inches.

a)What height separates the shortest 20% of 12-month-old boys from the rest?

b)What height separates the tallest 30% of 12-month-old boys from the rest?

2)According to the 1998 Health and Human Service's National Household Survey on Drug Abuse, 18% of children between the ages of 12 and 17 are cigarette smokers.If 8 children in this age group are selected randomly find the probability that 2 of them are cigarette smokers.You may assume this is a binomial probability.