Identify the 40th percentile in the given set of data:

28, 29, 35, 37, 42, 45, 47, 55

Solve for the 70th percentile of the given set of data

23, 17, 14, 25, 30, 19, 24, 28

Solve for the median of the given set of data: 25, 18, 13, 26, 29, 20, 23

Find the 30th percentile given the scores of 9 students in their periodical test.

45, 38, 35, 29, 54, 54, 43, 42, 38

Solve for the difference of the 99th percentile and 10th percentile of the given set of data : 48, 42, 56, 53, 59, 66, 60