Question

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?

Answer 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?

Answer 2

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

Answer 3

Yes you definitely do need 1-0.93. Psydag, you are correct!