# Statistics - Probability

The probability of receiving a "false positive" from a mammogram is 7%. What is the probability that out of 10 mammograms, a patient receives at least 1 false positive?

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asked by Ana
1. Pr(at least one false)=1-pr(gettingnofalse)=1-.83^10

.83^10=.155, so pr(getting at least one false in 10) is 1-.155=.845

Hmmm. So, the thought of annual mammograms is comforting?

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2. Since the false positive p = .07, wouldn't you need 1-.93 as P of not getting false positive?

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posted by PsyDAG
3. Yes you definitely do need 1-0.93. Psydag, you are correct!

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posted by Jake

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