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Neeraj from Wilson's School noticed that sets A, D and E had more values greater than 70 than sets B, C and E.
Elliot from Wilson's School used the range:
I used the ranges of each set of data, to work out which sets go together. Alison's temperatures were more likely to have a greater range, whereas Charlie's data, on the weights of teenagers, is unlikely to have a small range. Therefore, I concluded that A, D and E, which have the largest ranges, were the temperatures, while B, C and F were the teenager's weights.
Randolph and Ethan, both from the USA, and Jelle from the Netherlands used another measure of spread, the standard deviation of each set:
The standard deviations for each set (to 3 decimal places) are:
ADE belongs to Alison
BCF belongs to Charlie
Finally, here is Niharika's solution which uses several different approaches.