calculate an average

2:16

3:17

25:30

11:33

8:53

9:18

7:35

4:42

4:42

3:54

8:20

5:07

5:07

6:39

9:45

8:59

5:17

1:34

5:15

8:29

5:28

4:22

3:50

3:07

12:55

5:30

19:27

2:08

9:49

54:17

35:05

2:55

15:11

15:13

14:15

1:44

4:37

6:17

7:00

3:16