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Question
The consumption of electricity (in units) for one month of 36 houses in a colony are given below:
| 63 | 72 | 98 | 121 | 129 | 120 | 74 | 95 | 81 | 65 | 51 | 59 | 118 | 106 | 96 | 88 | 84 | 110 |
| 68 | 112 | 87 | 93 | 81 | 78 | 115 | 100 | 113 | 124 | 79 | 116 | 102 | 123 | 110 | 104 | 108 | 103 |
Construct a grouped frequency distribution table by taking classes 50 - 60, 60 - 70, ...
Sum
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Solution
| Class Interval (in units) |
Tally Marks | Frequency |
| 50 - 60 | `bb|bb|` | 2 |
| 60 - 70 | `bb|bb|bb|` | 3 |
| 70 - 80 | `bb|bb|bb|bb|` | 4 |
| 80 - 90 | `cancel(bb|bb|bb|bb|)` | 5 |
| 90 - 100 | `bb|bb|bb|bb|` | 4 |
| 100 - 110 | `cancel(bb|bb|bb|bb|) bb|` | 6 |
| 110 - 120 | `cancel(bb|bb|bb|bb|) bb|bb|` | 7 |
| 120 - 130 | `cancel(bb|bb|bb|bb|)` | 5 |
| Total | 36 |
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