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 March 26th, 2011, 01:01 PM #1 Newbie   Joined: Mar 2011 Posts: 8 Thanks: 0 Normal Approximation 10% of vehicles crossing the international boarder are smuggling goods. If officers search 400 vehicles at random, what is the probability that more than 100 of the vehicles are smuggling?
 March 26th, 2011, 02:52 PM #2 Global Moderator   Joined: May 2007 Posts: 6,704 Thanks: 669 Re: Normal Approximation Average for 400 is 40, standard deviation = (.1x.9x400)^1/2 = 6. So you need to get probability > 10 s.d. above average.

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