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Question

Find the mean of the following data, using assumed-mean method:
Class02020404060608080100100120Frequency203552443831

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Solution

Solution:
ClassFrequency(fi)Mid values (xi)Deviation(di=xi50)fidi020201040800204035302070040605250=A00608044702088080100389040152010012031110601860fi=220fidi=2760
Let A= assumed mean =50.
Mean, ¯¯¯x=A+fidifi
=50+2760220
=50+12.55
=62.55


Hence, the mean of the given data is 62.55


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