The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate


Literacy rate (in %)



45 - 55



55 - 65



65 - 75



75 - 85



85 - 95



Number of cities



3



10



11



8



3


The above given data can be represented in the form of table as below:


Class Interval



fi



xi



ui



fiui



45-55



3



50



-2



-6



55-65



10



60



-1



-10



65-75



11



70



0



0



75-85



8



80



1



8



85-95



3



90



2



6




∑fi= 35





∑fiui= -2





= 69.42


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