26 cee 202 engineering risk uncertainty

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Unformatted text preview: wrote as P(one or more fatality)=1 ­P(0 fatality| 0 accident)*P(0 accident), which is wrong, because you need to consider the situation that no fatality but one or more accidents occur. About 80% students used the method in hint (ii), which is poisson distribution with new definition of lambda (number of fatalities per year). Wrong calculation or expression of the probability costs 1 point. 2/6 CEE 202 – Engineering Risk & Uncertainty Spring 2011 (Bond) Homework 7 Distributions Aplenty 2) 15 points A process yields 11% defective items. If 100 items are randomly selected from the process, what is the probability that the number of defective items a) exceeds 20? b) is less than 9? Use normal approximation to binomial µ = n p = 100 * 0.11 = 11 σ 2 = n p (1 ­p)= 100 * 0.11 * (1 ­0.11)= 9.79 σ = 3.13 a)...
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This document was uploaded on 03/06/2014 for the course CEE 202 at University of Illinois, Urbana Champaign.

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