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In the formula bar(x)=a+(sumf(i)d(i))/(s...

In the formula `bar(x)=a+(sumf_(i)d_(i))/(sumf_(i))`
for finding the mean of grouped data `d_(i) 'S` and 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

Text Solution

Verified by Experts

The correct Answer is:
C
We know that, `d_(i)=x_(i)-a`
i.e., `d_(i)'s` are the deviation from a of mid-points of the classes
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