Frequency x Midpoint = What?

Question

When finding the mean of grouped data, at some point you need to do: Frequency x 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

Answer 1

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.