2010 30196 2009 30862 2008 34172 2007 37435 2006 38648

2010 ---------------- 30,196

2009 ---------------- 30,862

2008 ---------------- 34,172

2007 ---------------- 37,435

2006 ---------------- 38,648

2005 ---------------- 39,252

2004 ---------------- 38,444

2003 ---------------- 38, 477

2002 ---------------- 37,491

2001 ---------------- 37, 862

2000 ---------------- 37,526

Standard Deviation is 3185.42

*Standard Deviation population is 3037.18

1. Find the 68% standard deviation for the above data

Solution

At 68 % the rule is,
= (Mean - std) and (Mean + std)

mean=36396.8

std=3185.4

Empirical Rule at 68% falls between

33211.4 and 39582.2