77% of all bald eagles survive their first year of life. Give your answers as decimals, not percents. If 40 bald eagles are randomly selected, find the probability that
a. Exactly 31 of them survive their first year of life.

b. At most 29 of them survive their first year of life.

c. At least 29 of them survive their first year of life.

d. Between 25 and 30 (including 25 and 30) of them survive their first year of life.