I need help with the underlined question. I need to know what calculator function is used and an explanation, please.

In a certain area, 31% of people own a cat. Complete parts a and b below.

a. Find the probability that exactly 3 out of 9 randomly selected people in the area own a cat.

The probability that exactly 3 out of 9 randomly selected people in the area own a cat is .270.

b. In a random sample of 9 people from this area, find the probability that more than 4 own a cat.

(Type an integer or decimal rounded to three decimal places as needed.)