The monthly electricity consumption (in units) of 100 households of a town is grouped as follows:
Units consumed (in a month) : 0–50 | 50–100 | 100–150 | 150–200 | 200–250 | 250–300 | 300–350
Number of households : 5 | 14 | 23 | 22 | 18 | 10 | 8
(i) Prepare a ‘less than’ cumulative frequency table for the above data.
(ii) Draw the cumulative frequency curve (ogive) on graph paper by taking suitable scales.
(iii) Using the ogive, estimate the median monthly consumption of electricity for these households.