Hi Angliholic You could say it that way -- as long as it's clear from the previous context that you're referring to people. Otherwise, you could add the word 'human', for example: There are between 100,000 and 150,000 strands of hair on the average human head. ) Or you could say this: On average, there are between 100,000 and 150,000 strands of hair on a person's head.
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