9) You are given the data pertaining to Kilowatt hours of electricity consumed by 100 persons in a city.
Consumption
(Kilowatt Hours)
0-10 10-20 20-30 30-40 40-50
No. of Persons 6 25 36 20 13
Calculate the range within which the middle 50 percent of the consumers fall. As find range and quartile deviation

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