1) An Olympic archer is able to hit the bull’s eye 80% of the time. Assume that each shot is independent of the others. If she shoots 6 arrows, what is the probability of each result below?
a) She gets exactly 4 bull’s-eyes.

b) She gets at most 4 bull’s-eyes.

c) She gets at least 4 bull’s-eyes.

d) She misses the bull’s eye at least once.