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Unformatted text preview: ChBE 521 Homework 8 due Monday, November 30 1. Consider a game involving two sixsided dice. Plot the probability of observing each total value (with 2,3,...,12 on the horizontal axis) if the dice are fair. What is the probability that the 5th roll is the first appearance of a 4? What is the probability that at most 10 rolls are required for a 2 (”snake eyes”) to be observed? How many times, on average, must one roll the dice before a 7 is observed? 2. The central limit theorem of statistics states that the sum of many in dependent random variables tends toward a normal distribution without regard to the shape of the underlying distribution. Consider the statis tic X that is a sum of N random variables u j ,j ∈ 1 ,N , each uniformly distributed on [0 , 1], X = N X j =1 u j . For N = 100 , 1000 , 10000 plot in MATLAB the distribution of X as a histogram and fit it to a normal distribution pdf. As N increases, does P ( X ) indeed approach a normal distribution? Repeat the calculations for) indeed approach a normal distribution?...
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This note was uploaded on 11/30/2010 for the course CHBE CHBE521 taught by Professor Chrisrao during the Spring '10 term at University of Illinois, Urbana Champaign.
 Spring '10
 ChrisRao

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