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Unformatted text preview: (0.45) = 0.6736 . ( Binomial distribution, n = 625, p = 0.20, P(X < 130) = 0.6765. ) 2. (5) The number of customers who visit a small local book shop follows a Poisson distribution with the average rate of 2.7 customers per day. Find the probability that more than 85 customers would visit the shop in one month (30 days). (Use Normal approximation.) Need P(X > 85) = ? o = = 30 2.7 = 81. = = 9. t 0.5 correction: do not want 85, want 86. P(X > 85.5) = ? T P(X > 85.5) = P < 9 81 5 . 85 Z = P(Z > 0.50) = 1 (0.50) = 0.3085 . ( Poisson distribution, = 81, P(X > 85) = 0.3037. )...
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 Spring '08
 Kim

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