Monthly consumption (in units) | Number of consumers |
65-85 | 4 |
85-105 | 5 |
105-125 | 13 |
125-145 | 20 |
145-165 | 14 |
165-185 | 8 |
185-205 | 4 |
Monthly consumption (in units) | Number of consumers fi | Cumulative frequency |
65-85 | 4 | 4 |
85-105 | 5 | 9 |
105-125 | 13 | 22 |
125-145 | 20 | 42 |
145-165 | 14 | 56 |
165-185 | 8 | 64 |
185-205 | 4 | 68 |
Total | n=68 |
Monthly consumption (in units) | Number of consumers | Class mark xi | ui=xi−13520 | fi×ui |
65-85 | 4 | 75 | -3 | -12 |
85-105 | 5 | 95 | -2 | -10 |
105-125 | 13 | 115 | -1 | -13 |
125-145 | 20 | 135=a | 0 | 0 |
145-165 | 14 | 155 | 1 | 14 |
165-185 | 8 | 175 | 2 | 16 |
185-205 | 4 | 195 | 3 | 12 |
Total | n=68 | 7 |