Return-Path: william@bourbon.usc.edu
Delivery-Date: Thu Sep 25 17:59:40 2008
X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on merlot.usc.edu
X-Spam-Level: 
X-Spam-Status: No, score=-2.3 required=5.0 tests=AWL,BAYES_00 autolearn=ham
	version=3.2.3
Received: from bourbon.usc.edu (bourbon.usc.edu [128.125.9.75])
	by merlot.usc.edu (8.14.1/8.14.1) with ESMTP id m8Q0xeAu020326
	for <cs551@merlot.usc.edu>; Thu, 25 Sep 2008 17:59:40 -0700
Received: from bourbon.usc.edu (localhost.localdomain [127.0.0.1])
	by bourbon.usc.edu (8.14.2/8.14.1) with ESMTP id m8Q12rNU030568
	for <cs551@merlot>; Thu, 25 Sep 2008 18:02:53 -0700
Message-Id: <200809260102.m8Q12rNU030568@bourbon.usc.edu>
To: cs551@merlot.usc.edu
Subject: Re: Unit for std deviation
Date: Thu, 25 Sep 2008 18:02:53 -0700
From: Bill Cheng <william@bourbon.usc.edu>

Someone wrote:

  > Suppose I've got 1 customer dropped out of 50. (Yes, I am testing f2.txt.)
  > 
  > The drop probability should be 1/50 = 0.02.
  > 
  > However my printf using  %.6g always prints out 0.0204082
  >     printf("    customer drop probability = %.6g \n",
  > double(gNumDropped) / double(gNumSeved));
  > 
  > where gNumDropped and gNumServed are integer.
  > 
  > Do I need to fix my program?

I just wrote a program with your code above and I get 0.02.
I have no idea why you are getting that weird number.
--
Bill Cheng // bill.cheng@usc.edu <URL:http://merlot.usc.edu/william/usc/>