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Example 3.18 from Statistics, 3.3 Two Basic Rules of Probability
d. What is the probability that the woman has the disease OR tests negative?
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
d. P(B OR N) = P(B) + P(N) − P(B AND N) = .143 + .85 − .0029 = .9901
How did it go?