Answer:
60% of the professors are under 46 years old
Explanation:
Lining them up in age, you can add a line where the cap is (46 years old)
28 28 34 38 44 45 ||| 48 54 56 61
So this means that 6 of the 10 professors are under 46 years old. 6/10 as a percentage is 60%