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Patrick from Woodbridge school sent in the following solution:

"I made frequency graphs of the data sets and I tried to find similar features.

1. A G K M have no odd numbers so they are very likely to be one set.
2. D E L N have no early numbers or late numbers (they are all grouped around the middle)
3. C F H P have the same general shape - a rise up to 17 ish, then a very steep drop.
4. B I J O each have almost all the numbers centred in two peaks at around 7 and 13.

E could possibly be in group 4. C and H are not quite as well defined as the others. I would say that the best example of my definitions in each group is:

1. (none needed)
2. D
3. F
4. B