This question already has an answer here:
What is grammatically correct:
saying “4% of people was classified as introverts”.
Or saying
4% of people were identified as introverts.
The context is that I’m reporting the results of a survey.
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marked as duplicate by Andrew, Nathan Tuggy, user178049, John Feltz, ColleenV♦ Aug 12 '18 at 1:40
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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If the noun that follows a percentage of is plural, use a plural verb after it:
e.g. 45% of people are(NOT is) interested in politics.
e.g. Just 50% of U.S. adults now get (NOT gets) news regularly from television, down from 57% a year prior in early 2016.
And about your own example:
4% of people were (NOT was) identified as introverts.
