© 2004 Cayman Business
Systems
Rev:
Pre-G3 - Rendered Thursday,
February 12, 2004
Slide 24
Elsmar.com --- The
Cove!
8-Disciplines Problem Solving
Elsmar.com
Normal Distribution (Bell Curve)
This is a pattern which
repeats itself endlessly not only with pieces of
pie but in manufactured products and in nature.
There is always an inherent Variability. Sometimes it’s a matter of finding a measurement device sensitive enough to measure
it.
Measurements may be in volts,
millimeters, amperes, hours, minutes,
inches or one of many other units of measure.
It you take a sample of a
population (such as height) and you chart
their distribution, you will end up with a curve that looks like a bell.
A Distribution which looks like a bell is a Normal Distribution. Normal Distributions are the most common type of distribution
found in nature - but they are not the
ONLY type of distribution.
1.59
2.01
1.73
1.87
1.66
1.94
Heights of men
in the military:
Average height: 1.80 meters
Shortest: 1.59 meters
Tallest 2.01 meters
Sixty-eight percent are between 1.73 and 1.87 meters.
Ninety-five per cent are between 1.66 and 1.94 meters.