math
posted by joe .
during a special promotion, each customer who makes a purchase is given a coupon for a discount of either 10,20, 30,40, or 50 percent. if a customer has an equal chance of receiving any one of the 5 types of discount coupons,what is the probability that the first customer will receive a discount coupon for less than 25 percent?

p of any single value = 1/5 = .20
p of 10 = .20
p of 20 = .20
p of 10 or 20 = .40