The electricity bills (in rupees) of 40 houses in a locality are given below:
116, 127, 107, 100, 80, 82, 91, 101, 65, 95, 87, 81, 105, 129, 92, 75, 89, 78, 87, 81, 59, 52, 65, 101, 115, 108, 95, 65, 98, 62, 84, 76, 63, 128, 121, 61, 118, 108, 116, 130.
Construct a grouped frequency table.
Minimum data = 52
Maximum data = 130
Range = 130 – 52 = 78
Let the class size = 10
∴ Number of classes = or 8 classes
Class | Frequency |
52 – 62 | 2 |
62 – 72 | 6 |
72 – 82 | 6 |
82 – 92 | 6 |
92 – 102 | 7 |
102 – 112 | 4 |
112 – 122 | 5 |
122 – 132 | 4 |