2. The following data represent the graduation rate for a random sample of 60 colleges and universities in the United States.

86	59	65	55	59	40
90	48	37	65	67	67
39	53	82	57	71	46
83	77	40	52	92	38
56	57	36	61	34	54
69	35	73	29	92	39
24	48	41	46	79	41
44	43	28	61	49	65
48	42	72	35	58	39
80	75	44	52	52	47

With a first class having lower class limit of 20 and a class width of 10:

a. Construct a frequency distribution and a relative frequency distribution.

b. Construct a relative frequency histogram of the data.

c. Describe the shape of the distribution.