Question

Upper boundary of first class of data grouped by inclusive class intervals is :-

• A. average of lower limit of first class and lower limit of second class
• B. average of upper limit of first class and lower limit of second class
• C. average of lower limit of first class and upper limit of second class
• D. average of upper limit of first class and upper limit of second class

Answer 1

The correct option is B average of upper limit of first class and lower limit of second class

Average of upper limit of first class and lower limit of second class becomes the upper boundary of the first class.

And it also becomes the lower boundary of second class.

For example:-

Limits	Boundaries
1-10	0.5 - 10.5
11-20	10.5 - 20.5

Upper boundary of the first class = Lower boundary of the second class = $\frac{10+11}{2}$ = 10.5