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Mathematics 13 Online
OpenStudy (anonymous):

According to the Promotion Marketing Association, 77% of all Americans use coupons, saving more than 3 billion dollars each year on purchases. Suppose 20 Americans are randomly selected. What is the probability that at least 18 use coupons

OpenStudy (anonymous):

1-0.23^20-20*0.77*0.23^19

OpenStudy (anonymous):

i get an answer of one but its saying its wrong

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