Q. 114.7( 3 Votes )

Use the step-deviation method to find the arithmetic mean from the following data.

Answer :

Let the assumed mean be A = 21

= h = x2 – x1 = 19 – 18 = 1

Thus, we prepare the table given below:

We Know that,

Mean =

Hence, The Mean value of given distribution = 20.62.

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