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Fig. 2.4 Examples of the effect of averaging illustrate the central limit theorem of mathematical
statistics. No matter what shape the frequency distribution of the original observations (a), taking
the average of two (b), four (c)or25(d) observations not only decreases the variance but brings
the curve closer to the normal (or Gaussian) limit (After Lapin
1982
; Davis
1986
) (Source:
Agterberg
1990
, Fig. 2.18)
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