73 75 58 43 49 65 67 75 51 97 82 65 89 59 55 70 60 70 38 60
45 75 73 65 76 50 87 55 71 75
70 83 61 75 69 54 40 78 85 35
32 72 89 65 45 75 64 93 85 63

Construct a frequency distribution using seven classes.