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March 26th, 2011, 01:01 PM   #1
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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?
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March 26th, 2011, 02:52 PM   #2
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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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