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关于中心极限定理如何理解

如题,请大师们详述如何理解好吗?当然能提出个别使用例就最好了!!(http://www3.6sq.net/cdb/pic/d1 ... 89.gif)
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龙天 (威望:137) (广东 广州) 互联网 6SQ管理员 - 我努力,我进步,我付出,我收获,我坚持,我成功!

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If random samples of n measurements are repeatedly
drawn from a population with a finite mean µ and a standard
deviation σ, then, when n is large, the relative frequency
histogram for the sample means (calculated from the
repeated samples) will be approximately normal with a
mean µ and a standard deviation equal to the population
standard deviation, σ, divided by the square root of n.
(Note: The approximation becomes more precise as n
increases.)
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