1. Choose the correct answer from the given four options in the formula  x ¯   =   a   +   f i x i f i
 For finding the mean of grouped data di's are deviations from a of
(a) lowers limits of the classes          (b) Upper limits of the classes
(c) Mid points of the classes             (d) Frequencies of the class marks

Dear student,

In a mean of grouped data di's are deviation from the midpoint of the classes.
Thus option C is correct.


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Midpoint if class
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