The Student Room Group
That's not easy to do properly.

Pearson's skewness coefficient might be useful to you.

http://en.wikipedia.org/wiki/Skewness

http://www.mathsrevision.net/alevel/pages.php?page=55
Reply 2
Quartile measure of skewness = Q3 – 2Q2 + Q1/Q3 – Q1

thats probably it.
thank you
No problem - I wasn't sure what level you are working at.

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