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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 this survey?
11 years ago

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Steve
.85^4
11 years ago
Anonymous
How do you know to do that operation?
11 years ago
John
Update ?
10 years ago

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