Electricity usage (units) |
Number of households |
less than 80 – 90 |
3 |
less than 90 – 100 |
9 |
less than 100 – 110 |
16 |
less than 110 – 120 |
26 |
less than 120 – 130 |
35 |
less than 130 – 140 |
39 |
Half of the number of houses = 20
We have to find the electricity usage of the 20th house. According to this, we can divide