# Average between two date columns based on a specific condition

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I want to calculate the average days between two date columns for a specific status (ABC).

I have a column for the average days named: "Avg Days (Req to Sent)" and this is my formula

=IF([Type]@row = "ABC", [Sent Date]@row - [Requested Date]@row, "Not ABC")

This works.

Now I want to calculate the average days from this column and ofcourse only the ones that have a number, because for the ones that don't satisfy the logic above it writes "Not ABC" in the cell. I put this formula in the sheet summary but I'm getting "#BLOCKED"

=AVG(COLLECT([Avg Days (Req to Sent)]:[Avg Days (Req to Sent)], [Avg Days (Req to Sent)]:[Avg Days (Req to Sent)], ISNUMBER(@cell)))

What am I doing wrong here?

Appreciate the help!!! :)

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Options

How about an AVERAGEIF function @jerry123 ?

Rather than collecting and averaging, you could use an average if the cell is a number.

=AVERAGEIF([Avg Days (Req to Sent)]:[Avg Days (Req to Sent)], ISNUMBER(@cell))

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