Twenty-five percent of the customers of a grocery store use an express checkout. In a random survey of ten customers: (round 3 decimal places) a) Find the probability that no more than two uses...

Twenty-five percent of the customers of a grocery store use an express checkout. In a random survey of ten customers: (round 3 decimal places)
a) Find the probability that no more than two uses express checkout.
b) Find the probability that at least 8 use express checkout.
c) Find the probability that exactly half of the sample use express checkout.