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OpenStudy (a1234):
A pollster conducts a survey by phone. The probability that a call does not result in a person taking this survey is 85%. What is the probability that the pollster makes 4 calls and none result in a person taking the survey?
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OpenStudy (anonymous):
(85/100)^4
OpenStudy (a1234):
How do you know to do that?
OpenStudy (a1234):
Oh, I think I get it.
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