Question

Lower boundary of class of grouped data is ________.

• A. average of lower limit of previous class and lower limit of current clas
• B. average of upper limit of previous class and lower limit of current class
• C. average of lower limit of previous class and upper limit of current class
• D. average of upper limit of previous class and upper limit of current class

Answer 1

The correct option is B average of upper limit of previous class and lower limit of current class

Upper boundary of the first class and the lower boundary of the second class is the average of upper limit of first class and lower limit 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