1) Use the normal approximation to the binomial to find the probability of X = 20 when n = 30 and p = 0.5.
2) Of all 3 - 5 year old children, 71% are enrolled in school. If a sample of 400 children are randomly selected, what is the probability that at least 300 will be enrolled in school.
3) 5% of theater patrons do not show up for the performance. If the theater has 120 seats, what is the probability that 6 or more will not show up to a particular performance.