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February 26th, 2016, 12:00 PM  #1 
Newbie Joined: Feb 2016 From: Illinois Posts: 8 Thanks: 0  Mean and standard deviation of a discrete probability distribution
How would I get started solving this? Air America has a policy of routinely overbooking flights because past experience shows that some passengers fail to show. In the probability distribution given below, the random variable x represents the number of passengers who cannot be boarded because there are passengers than seats. Find the mean and standard deviation of this probability distribution x P(x) 0 0.809 1 0.123 2 0.057 3 0.009 4 0.002 
February 26th, 2016, 01:33 PM  #2 
Member Joined: Apr 2014 From: Birmingham, AL Posts: 36 Thanks: 4 
mean= E[X] = sum(x*p(X=x)) variance = E[X^2]E[X]^2 = sum(x^2*p(X=x))(sum(x*p(X=x)))^2 Last edited by mathman; February 26th, 2016 at 05:14 PM. 

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