66% of owned dogs in the United States are spayed or neutered. Round your answers to four decimal places. If 33 owned dogs are randomly selected, find the probability that

a. Exactly 20 of them are spayed or neutered.

b. At most 24 of them are spayed or neutered.

c. At least 23 of them are spayed or neutered.

d. Between 18 and 26 (including 18 and 26) of them are spayed or neutered.