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[QUOTE="Ray Vickson, post: 5055978, member: 330118"] This is like a coin-tossing problem, but with a biased coin having ##P(\text{heads}) = p##. Here, ##p## is the probability that an individual has DBP > 90; you claimed that ##p = 0.0125## but that is not so. Anyway, for any value of ##p## (whether correct or not) you now ask: if you toss your biased coin 5 times, what is the probability of getting at least 4 heads? Getting a 'head' in a toss is like an individual having DBP > 90, so that is really the same question as the one you are asked. Surely you have seen similar coin-tossing probability problems in the past? [/QUOTE]
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