1. What is the probability of
(a) Getting exactly 4 heads and 2 tails in 6 tosses of a balanced coin?
(b) Getting 3 sixes in 4 rolls of a fair die?
2. (a) If 20% of the students entering college drop out before receiving their diplomas, ?nd the probability that out of 20 students picked at random from the very large number of students entering college, less than 3 drop out.
(b) If 90% of the bulbs produced in a plant are acceptable, what is the probability that out of 10 bulbs picked at random from the very large output of the plant, 8 are acceptable?