Assertion (A): The step-deviation method of computing the mean is used mainly to reduce the arithmetic when class marks and frequencies are large. Reason (R): In the step-deviation method, uᵢ = (xᵢ − a)/h, where h is the common class size.

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Assertion-ReasonMean of Grouped Data Using Step Deviation Method

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The following data gives the distribution of total monthly household expenditure of 200 families of a village. Find the modal monthly expenditure of the families. Also, find the mean monthly expenditure.

TextMean of Grouped Data Using Step Deviation MethodFormula for Mode of Grouped Data

In the formula x̄ = a + h(Σfᵢuᵢ/Σfᵢ), for finding the mean of grouped frequency distribution, uᵢ =

MCQ (Single)