In a recent study, 90% of the homes in the United States were found to have large-screen

Question:

In a recent study, 90% of the homes in the United States were found to have large-screen
TVs. In a sample of nine homes, what is the probability that:
a. All nine have large-screen TVs?
b. Less than five have large-screen TVs?
c. More than five have large-screen TVs?
d. At least seven homes have large-screen TVs?