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what's the relation between mean n median in a skewed positive n negative distribution curve?

median is always the middle of the curve
mode is the tallest point(on x axes)
mean is to the rt or lft or the middle or median: given the +sk(rt of the median) or -sk (lft of the median) (see the figure).
http://www.sendspace.com/file/d8qlo7

watch this:
http://video.google.com/videoplay?docid=...8534296681

thanks

Nice link thanks a lot John...