
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
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: 6,755 Thanks: 695  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.


Tags 
approximation, normal 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
normal to the curve/normal to the circle  cheyb93  Calculus  7  October 29th, 2012 01:11 PM 
Normal approximation to the Poisson distribution + others  saman  Advanced Statistics  4  August 9th, 2011 10:35 AM 
normal approximation  fc_groningen  Advanced Statistics  1  July 1st, 2011 01:14 PM 
Analytical Approximation with bivariate normal distribution  Stephard  Algebra  0  June 5th, 2010 02:07 AM 
Product normal implies components normal  cos5000  Real Analysis  3  November 18th, 2009 08:52 PM 