These histograms graph the amount of time (hours per day) that 46 middle school girls and 40 middle school boys in San Francisco spend on the website FaceSpace. 50 boys and 50 girls took the survey but 4 girls and 10 boys did not use these sites at all. Each is graphed with a bar width of 0.25 hours.
How many boys spent between 0.5 hour and 0.75 hour on the site?
6
8
9
10