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Does the frequency have a unit? Ask the junior high school math teacher to answer.
Frequency has no unit, it is the number of times a certain kind of data appears. If you have to add a unit, it is consistent with the "total" in the original question, because

Frequency = frequency/total, frequency is a proportion, and there is definitely no unit. Besides, this question has nothing to do with math learning, so there is no need to take it too seriously.