Question

Question 7
In the class intervals, 10 - 20, 20 - 30, the number 20 is included in:

A) 10 - 20
B) 20 - 30
C) Both the intervals
D) None of these

Answer 1

The answer is B.
The class interval 10 - 20 is the first interval of frequency distribution and 20 - 30 is the next one but the number 20 is present in both intervals.
We know that the presence of 20 in the interval 10 - 20 is not fully $100\%$ while in the next intervals 20 - 30, the presence of it fully $100\%$.