Average of column if dates meet certain criteria

I'm looking for help on a formula to calculate an average of a column if the date in another column falls between the nominated start and end date. I tried a few different formulas which came up with #UNPARSEABLE, and this one: AVERAGEIF({Date Completed}, AND(>=[Start Date]@row, <=[End Date]@row, {Number})) resulted in zero. Any suggestions on how this formula should read?

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Accepted answers

B Young

Thank you - this is awesome! Solves the problem.

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Paul Newcome

Looks like a couple of minor syntax adjustments should get you working.

=AVERAGEIF({Date Completed}, AND(@cell>=[Start Date]@row, @cell<=[End Date]@row), {Number})

B Young

Thank you - this is awesome! Solves the problem.

Paul Newcome

Happy to help. 👍️

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