Answer :

⇒ Maximum amount of Electricity in class 60-80

⇒ 60-80 is modal class

L = lower limit of modal class = 60

h = class interval of modal class = 20

f_{1} = frequency of modal class = 100

f_{2} = frequency of class succeeding modal class = 80

f_{0} = frequency of class preceding modal class = 70

⇒ Mode =

⇒ Mode =

⇒ Mode =

⇒ Mode = 72 families

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