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| rev | Admin | (Created page with "'''Solution: C''' If <math>n_0</math> people are tested then the number of people with a particular rare blood type has a binomial distribution with <math>n=n_0, p=0.001 </math>. We need to find the smallest <math>n_0</math> such that <math display = "block"> P(N \geq 1) = 1 - (1-p)^{n_0} \geq 1/2 \implies n_0 \geq \frac{\log(1/2)}{\log(1-p)} = 692.81 </math> Hence the answer is <math>n_0 = 693 </math>.") | Jun 26'24 at 16:27 | +409 |