73% of all bald eagles survive their first year of life. Give your answers as decimals, not percents. If 31 bald eagles are randomly selected, find the probability that

a. Exactly 23 of them survive their first year of life.

b. At most 25 of them survive their first year of life.

c. At least 21 of them survive their first year of life.

d. Between 22 and 29 (including 22 and 29) of them survive their first year of life.