The electricity bills (in rupees) of 40 houses in a locality.

The electricity bills (in rupees) of 40 houses in a locality are given below:
78 87 81 52 59 65 101 108 115 95
98 65 62 121 128 63 76 84 89 91
65 101 95 81 87 105 129 92 75 105
78 72 107 116 127 100 80 82 61 118
Form a frequency distribution table with a class size of 10. Also represent the above data with a histogram and frequency polygon.

Solution:

Least term = 52
Greatest term = 129
Range = 129 – 52 = 77