Answer to Question #72633 in Statistics and Probability for Danish

Question

A nationwide survey of college seniors by the
University of Michigan revealed that almost 70% disapprove
of daily pot smoking, according to a report in
Parade. If 12 seniors are selected at random and asked
their opinion, find the probability that the number who
disapprove of smoking pot daily is
(a) anywhere from 7 to 9;
(b) at most 5;
(c) not less than 8.