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Kelly Kavanagh

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Hide error on forumal until calculated - formula is an Array

I have a table that has averages and stdeva - the later of which is an array.  I want to have all the #DIV/0!'s hidden until there is an actual calculation.
Any help would be as always greatly appreciated :)

Ok so i cant attach my file so will do the best i can to explain....

I was able to write:  
=IFERROR((AVERAGEIF(Summary!$C$2:$C$61,A3,Summary!$G$2:$G$61)),"")  
... this works for all cells except the array one.

How do I get this to hide until it calculates.... right now it shows the #DIV/0!
{=STDEV(IF(Summary!$C$2:$C$61=A3,Summary!$G$2:$G$61))}
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Kelly Kavanagh

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thanks again!