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Question

Calculate the mean of the following distribution using step - deviation method.

Class IntervalFrequency30401040506506086070127080580909
  1. 54
  2. 60
  3. 58.6
  4. 59.6


Solution

The correct option is D 59.6

Class IntervalFrequency(fi)xiui=xiahfiui30401035330405064521250608551860701265=a007080575158090985218 fi=50  fiui=27

Mean=a+hfiuif
               =65+10×(27)50=655.4=59.6

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