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Unformatted text preview: What is the probabilty that at least two people will buy it? Let X be the number of people who will buy the advanced version (buy advanced version=Success!) To use the Binomial model, need p = P (buy advanced version) p = P (buy advanced version) = P (buy advanced version  complete all levels) P (complete all levels) = ( . 03)( . 6) = . 18 Thus we have X Bin (15 ,. 18) and therefore E [ X ] = np = 15( . 18) = 2 . 7 and P ( X 2) = 1P ( X = 0)P ( X = 1) = 1(1p ) nnp (1p ) n1 = 0 . 7813...
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 Spring '11
 Zhou
 Binomial, Probability

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