The following frequency distribution gives the monthly consumption of electricity of 64 consumers of a locality.
Monthly consumption (in units) | 65 - 85 | 85 - 105 | 105 - 125 | 125 - 145 | 145 - 165 | 165 - 185 |
Number of consumers | 4 | 5 | 13 | 20 | 14 | 8 |
Form a 'more than type' cumulative frequency distribution.
In a ‘less than type’ cumulative frequency distribution, lower limits of the classes are considered.
It is given by,
MONTHLY CONSUMPTION (in units) | CUMULATIVE FREQUENCY(Cf) |
More than 65 | 60 + 4 = 64 |
More than 85 | 55 + 5 = 60 |
More than 105 | 42 + 13 = 55 |
More than 125 | 22 + 20 = 42 |
More than 145 | 8 + 14 = 22 |
More than 165 | 8 |