Question:
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
Solution:
(b) Since, 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 interval 20-30, presence of it fully 100%.