Quote:
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Originally Posted by Yakk
*nod*, that is the annual success rate.
If the drugs where taken properly, and there is nothing 'unusual' that prevented them from working, with a 99.5% chance of success, over 9 years, the chance of failing 3 times is...
9C3 * 200^-3 * .995^6
=
9*8*7/6 * 200^-3 * .995^6
roughly one in 100,000.
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Actually, I believe that the number is based on an average of all users. Hence, the reason the success rate of condoms is so "low" is because of all the people who don't use condoms correctly.
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