Did I do these correctly

In each case, find the mean, median, and mode of the listed numbers.

15. Perception of Time. Actual times (in seconds) recorded when statistics students participated in and experiment to test their ability to determine when one minute (60 seconds) had passed:

53 52 75 62 68 58 49 49

Mean: 58.25 53+52+75+62+65+58+49+49= 466466/8=58.25

Median: 55.549 49 52 53 58 62 68 7553+58=111111/2=55.5

Mode: 4953 52 75 62 68 58 49 49

In each case, find the range and standard deviation.

11. Perception of Time. Actual times (in seconds) recorded when statistics students participated in an experiment to test their ability to determine when one minute (60 seconds) had passed:

53 52 75 62 68 58 49 49

Range: 2649 49 52 53 58 62 68 7575-49=26

Standard Deviation: 8.9

Mean is 58.25

49-58.25= -9.25

49-58.25= -9.25

52-58.25= -6.25

53-58.25= -5.25

58-58.25= -0.25

62-58.25= 3.75

68-58.25= 9.75

75-58.25= 16.75

-9.25*-9.25= 85.5625

-9.25*-9.25= 85.5625

-6.25*-6.25=39.0625

-5.25*-5.25= 27.5625

-0.25*-0.25=0.0625

3.75*3.75=14.0625

9.75*9.75=95.0625

16.75*16.75=280.5625

85.5625+85.5625+39.0625+27.0625+0.0625+14.0625+95.0625+280.5625= 627.5

627.5/8= 78.4375

Square root of 78.4375 is 8.85649479, rounded to 8.9.