Birth control pills have a theoretical annual efficacy of 99.5%, but a real world efficacy of only
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Question:
Birth control pills have a theoretical annual efficacy of 99.5%, but a real world efficacy of only 95%. if a college student takes the pill for the four years she is in college, what is the probability that she will become pregnant at least once using the real-world efficacy rate?
A. 0
B. 0.005
C. 0.019
D. 0.185
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