Hi I'm stuck this problem. I need solution of a b c and d. thank you !!

The following sample data are the midterm examination test scores for 30 students: 55 60 91 85 60 70 89 99 59 67 72 82 60 68 57 74 64 70 68 91 89 90 83 40 79 85 71 80 76 81 a. Find the mean, variance, standard deviation, mode, median, , and of the data. b. Construct a frequency table with five classes. c. Using the grouped data formula, find the mean, variance, standard deviation, mode, median, , and for the table in part (b) and compare it to the results in part (a). d. Construct a histogram