How many hairs are there in human hair in average?

a lot

On the average there are over one hundred thousand strands of hair on a young adult. Blondes average about 140,000 strands, brunettes average 108,000 and redheads average 90,000. Hair grows at a rate of about 150mm a year and each individual hair lasts for two to six years before it falls out, the follicle has a rest for a while, while another takes its place. Hair grows quickest in young adult women aged between sixteen and twenty-four (who are often then at the height of their possible reproductive capacity)

(i got this answer from Yahoo answers)