Twenty five percent of the customers of a grocery store use an express checkout. Consider five randomly

Question:

Twenty five percent of the customers of a grocery store use an express checkout. Consider five randomly selected customers, and let x denote the number among the five who use the express checkout.
a. Calculate p(2), that is, P(x = 2).
b. Calculate P(x ≤1).
c. Calculate P(2 ≤ x).
d. Calculate P(x Þ 2).