Q. 174.8( 4 Votes )

The following tab

Answer :

From Direct method:

Mean =


= = 25.857


Assumed mean method: let assumed mean (A) = 25


Mean = A +



Mean = A +


= 25 + = 25 + 0.857


= 25.857


Step deviation method: Let the assumed mean (A) = 25



Mean = A + * h


= 25 + * 10


= 25 + 0.857 = 25.857


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