Suppose that 100 students are enrolled in a statistics class and the following are the test scores received by them:

77 44 49 33 38 33 76 55 68 39 44 59 36 55 47 61 53 32 65 51

29 41 32 45 83 58 73 47 40 26 59 43 66 44 41 25 39 72 37 55

34 47 66 53 55 58 49 45 61 41 55 92 83 77 45 62 45 36 78 48

54 50 51 66 80 73 57 61 56 50 45 82 71 48 46 69 38 72 56 64

38 45 51 44 41 68 45 92 43 12 37 16 44 57 63 71 40 64 57 51

(a) Construct a frequency distribution taking a suitable class interval.

(b) Present the data graphically and comment.

(c) Calculate the mean and modal scores and comment.

(d) Calculate the standard deviation of the scores and comment.