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Question 1
In the formula ¯x=a+fidifi, for finding the mean of grouped data dis are deviation from a of
(a) lower limits of the classes
(b) upper limits of the classes
(c) mid-points of the classes
(d) frequencies of the class marks

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Solution

We know that, di=xia
i.e., dis are the deviation from a of mid-points of the classes.

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