#
1. Choose the correct answer from the given four options in the formula $\overline{x}=a+\frac{\sum _{}^{}fixi}{\sum _{}fi}$

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

In a mean of grouped data di's are deviation from the midpoint of the classes.

Thus option C is correct.

Regards

**
**