77.8 71.3 55.6 43.0 38.5 34.6 28.5 25.7 24.5 23.1 22.4 22.2 21.5 21.1

20.2

18.2

17.5

16.0

15.8

15.5

15.1

15.0

14.7

14.2

14.1

13.7

13.5

13.1

12.0

11.8

11.6

11.1

11.1

10.9

10.3

10.2

9.9

7.9

7.7

6.5

6.2

4.6

4.5

4.5

3.6

3.2

1.9

1.8

1.4

0.8

this is data speeds from 50 airports is this a sample or population why