how do you find the coefficient of variation

4:13

4:32

4:27

7:10

7:24

17:57

8:52

8:13

6:12

3:55

1:36

2:12

1:23:00

4:33

5:30

13:46

4:21

4:30

کوتاه

2:48

2:25

1:06

1:58

2:12

54:21

6:57

2:49

13:00

9:30

13:00

9:30

13:51

16:11

4:28

2:22

1:12

1:04

3:48

5:31

5:31