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Finding the average of a multi select

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I’m having trouble even getting started. I know how I would do this in a real programming language, but I’m not sure how to use an airtable formula.

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I have a lookup field that is getting rankings (1-5) from another table. I’d like to average those rankings. The dumbed down version is just to average entries in a multi select.

I would expect to be able to use COUNT() and SUM() for that but I’m not getting anywhere.

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I’ve also tried to play with using a ROLLUP, but I’m not getting anywhere and I’m not sure how to ensure that the selections are registered as values.

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In this screenshot, “Calculated Rank” is just giving the result of VALUE({Rank (from Reviews)}) but it is just stringing them together so two values of 5 show up as 55. “Review Count” is accurately counting records where someone has put in a review. The “Rank Rollup” is just looking for a sum right now but it doesn’t appear to be recognizing the values as numbers, even though VALUE seems to.

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Is the {Rank (from Reviews)} field a Lookup? If so, does {Rank} field in the Review table a Single Select?

If so, that’s where your VALUE() formula should be. The Review table should have a Formula field that gets VALUE({Rank}) since there will just be the one selection per interview.

Then whatever table you’ve screenshotted would have a Rollup field that gets the sum or average of the Review table’s formula field.

Okay, that makes sense and seems to be working now.

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