My Math Forum tending to infinity for standard deviation

 July 16th, 2011, 08:57 PM #1 Newbie   Joined: Jul 2011 Posts: 1 Thanks: 0 tending to infinity for standard deviation hi all, I have a question that has me puzzled on an assignment ; if x tends to infinity based on some function (where x is a number) , does it imply that the standard deviation of x tend to Zero ? cheers, joey
 July 17th, 2011, 01:08 PM #2 Global Moderator   Joined: May 2007 Posts: 6,730 Thanks: 689 Re: tending to infinity for standard deviation Your question is confusing. Is x a number or a random variable? Numbers don't have standard deviations, random variables do.
 July 17th, 2011, 01:51 PM #3 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms Re: tending to infinity for standard deviation I also cannot understand the question. If it was "Suppose X(n) is a random variable with expected value that increases without bound with n. Is the limit of the standard deviation of X(n) as n increases without bound 0?" then the answer would be no.

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