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November 27th, 2007, 11:29 PM  #1 
Newbie Joined: Oct 2007 Posts: 15 Thanks: 0  help pls !!! asap
prove that one over square root of two pi times the integral of e raise to negative one half x squared, dx from positive infinity to negative infinity is equal to one. 
November 28th, 2007, 07:00 AM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 932 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms 
The integrand is the normal distribution's pdf. The fact that the integral is 1 means that there's a 100% chance of a normally distributed value falling from infty to +infty. you can probably Google for a proof. 
November 28th, 2007, 02:54 PM  #3  
Global Moderator Joined: May 2007 Posts: 6,216 Thanks: 493  Re: help pls !!! asap Quote:
 

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