calculation of mean and standard deviation

6:40

8:41

کوتاه

6:49

32:12

12:32

7:25

12:33

7:55

4:07

33:59

33:59

3:08

10:12

12:59

7:01

3:21

46:25

14:59

17:10

4:43

31:19

8:21

9:21

11:33

کوتاه

2:36

5:01

10:13

2:36

8:19

6:41

27:10

27:29

3:39

3:39

2:36

26:48

1:54

1:59