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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
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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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