How to calculate percent with string fields?

I need the percentage of a string field, example: in the image, the school field is a string field, the yellow is what I want to calculate, but since it is a string it is not possible. can someone tell me how to get that percentage?
image

percentOfTotal
(
count(School)
)

I would think this should do the trick for this example. If not it would likely be some variation using that function. percentOfTotal - Amazon QuickSight

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Excellent! thank you very much!

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