Hi. I am trying to find a formula to calculate the average of the
first 20 values in a column, then the average of the 20 20 values and
then the average of the third 20 values etc.

I tried to do this by simply summing the first 20 values and dividing
them by 20: sum(B2:B21)/20. This works for the first value but when I
used autofill to populate the next formula I get sum(B3:B22)/20 NOT
sum(B22:B41)/20 which is what I want.

I'm sure there must be a straightforward way of achieving this but
I've not yet been able to work it out. Please help!

Thanks in advance.

Nick

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