1.

The table shows some households sorted according to their usage of electricity:Electricity usage (units)Number of households80 – 90390 – 1006100 – 1107110 – 12010120 – 1309130 – 1404Calculate the median usage of electricity.

Answer»
Electricity usage (units)Number of households
less than 80 – 903
less than 90 – 1009
less than 100 – 11016
less than 110 – 12026
less than 120 – 13035
less than 130 – 14039

Half of the number of houses = 20

We have to find the electricity usage of the 20th house. According to this, we can divide



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