(a) lower limits of the classes (b) upper limits of the classes
(c) midpoints of the classes (d) none of these
Answer: (c) midpoints of the classes
Sol:
The ????????
′???? are the deviations from A of midpoints of the classes.
In the formula for the following the mean of the grouped data, the i d ’s are the deviations from A of
In the formula for the following the mean of the grouped data, the i d ’s are the deviations from A of