how to calculate mean in r studio

2:16

4:15

4:15

5:15

12:55

5:30

کوتاه

6:39

3:28

3:24

5:15

4:36

3:22

9:08

4:36

4:36

10:52

کوتاه

17:30

5:57

کوتاه

7:25

6:52

4:38

6:52

3:00

6:51

6:24

1:16

2:37

7:25

2:03

2:31

1:29

3:38

10:04

3:59

9:45

9:49

2:55