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When finding the mean of grouped data, at some point you need to do: Frequency $\times $ Midpoint = .....

Could someone tell me the name of the answer, does it have a name? Its labeled as fx in alot of places, but i dont actually know what to call it?

Thanks

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I would normally call it $ f \times m $, although if you want to give it a name you could say that it was an estimate of the total for that class interval (or group).

Sometimes I shorten it to just fm.

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Ah ok, that sounds reasonable, thank :) –  Jamie Jun 15 '11 at 13:05

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