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The Normal Distribution
Of all the distributions in nature,
the most ubiquitous is the normal, or
bell-shaped distribution.
The frequencies of height, distolic
blood pressure, systolic blood
pressure, body temperature, i.q., and
many other biologiacl measurements
follow the normal curve.
The normal distrbution is defined by
the probability density function
2 2
-(x-m) /2s
e
y = --------
------
) 2pi s
where m is mean, or middle of the
curve and s is the standard
deviation, or measure of the spread
of the curve.
When graphed the normal function
looks something like this:
**
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* * * *
--------------------------------------
m-2s m-s m m+s m+2s
for more information, see any book on
elementary statistics.
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