Mac numbers functions

If i have a spread sheet which is creating avearges and the these are linked to another sheet how can I make the function enter nothing in the first sheet if there is no data yet so that the second doesn't get confused with a zero input from the first? Hope that makes sense.

Hi Hamlet,
Footer Row so that the formulas apply to all Body Cells in a Column.
Formula in B8 =AVERAGE(B)
This works, even with some blank cells
Formula in C8 = AVERAGE(C)
Throws an error (can't divide by zero)
Formula in D8 =IFERROR(AVERAGE(D),"")
Puts "" (NULL) if there is an error.
Hope this helps. Regards,
Ian.

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