Hey diddle diddle,
The medians the middle,
You add and divide for the mean.
The mode is the one
That you see the most
And the range is the difference between!
Simples 
It may be very clever in a maths sort of way - I wouldn't know 
, but the fact that 'one' doesn't rhyme with 'most' has turned me against it!
Well, as a total mathematicalphobe, I don't even understand the riddle : it's a bit like University Challenge - if I could understand the question, I might be able to answer
Oh, thank goodness, Gally! I thought I was going to be the only one...
Eh? 
Oh I see - Hey Diddle Diddle. Well, you've got me there, durhamjen - enjoy!
Thanks Galen! I meant to take a note of this when you first posted it, but have now managed to track it down. Very useful and I hope it will be of interest to some who didn't see it first time round .
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