Question

In the formula `x-a+(sumf_i d_i)/(sumf_i),` for finding the mean of grouped data d₁'s are deviations from the ______.

Options

• lower limits of the classes

• upper limits of the classes

• midpoints of the classes

• frequencies of the class marks

Answer 1

In the formula `x-a+(sumf_i d_i)/(sumf_i),` for finding the mean of grouped data d₁'s are deviations from the midpoints of the classes.

Explanation:-

We know that d_i = x_i - a_i. i.e d_i’s are the deviations from the midpoints of the classes.