Calculate the percentage of students who submitted homework late

I have a Table of homework submission hours from multiple schools.

The table:

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|Student | School | homework submission hours (timestamp)|
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How can I get the percentage of students that took them more than an hour to submit homework for each school?



Read more here: https://stackoverflow.com/questions/66262550/calculate-the-percentage-of-students-who-submitted-homework-late

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