1. “STANDARD DEVIATION”
The “Standard Deviation” is a measure
of how spread out numbers are.
Its symbol is σ (the greek letter sigma)

2. 80
71.7
70
60 55.87
50
43.49 44.85 43.52 45.62 44.72
40 37.81
32.7
28.7 29.91
30
20
10
0
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

3. 80
71.7
70 Mean
60 55.87
50 43.49 44.85 43.52 45.62 44.72
40 37.81
32.7
28.7 29.91
30
20
10
0
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

4. 80
28.2
70
60 12.37 Mean
50
1.35 0.02 2.12 1.22
40
-0.01
30 -5.69
-10.8
-14.8 -13.59
20
10
0
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

5. 80
71.7 σ
70
60 55.87
M
50 12 E
43.49 44.85 43.52 45.62 44.72
A
40 12 37.81
N
32.7
28.7 29.91
30
20 σ
10
0
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011