I believe that implies 1 in 8 people are. Pc = Probability that someone is colorblind (1 - Pc) = Probability they aren't colorblind (1 - Pc)^5 = Pr

I believe that implies 1 in 8 people are. Pc = Probability that someone is colorblind (1 - Pc) = Probability they aren't colorblind (1 - Pc)^5 = Probability that no one in group of 5 is colorblind 1 - (1 - Pc)^5 = Probability that someone in group of 5 is colorblind Solve .5 = 1 - (1 - Pc^5): http://www.wolframalpha.com/input/?i=.5+%3D+1+-+%281+-+p%29%5E5 http://www.wolframalpha.com/input/?i=.5+%3D+1+-+%281+-+p%29%... You get .129449, which is approximately 1 in 8