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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: 6,807 Thanks: 717  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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