That's a pretty good average. I remember when I was about 12 and I got my first NSK mic -- I went around to all my family members and measured their hair. Assuming my technique was good (!) I got a range from 0.003" to 0.004". Black squirrel hair, as I recall, measured 0.002".Human hair is .003 ( I checked) head hair that is.
For some reason I am wondering about cat hair...