Question

The cumulative frequency of first group in more than cumulative frequency distribution is always equal to

• A. $x$
• B. $100$
• C. $\sum f$
• D. $\sum x$

Answer 1

The correct option is C $\sum f$

Class Marks	Frequency	Cumulative Frequency
0-10	4	40=4+(5+12+11+8)
10-20	5	36=5+(12+11+8)
20-30	12	31=12+(11+8)
30-40	11	19=11+(8)
40-50	8	8

The cumulative frequency of first group in more than cumulative frequency distribution is always equal to $\sum f$
Example: Here the total frequency is $\sum f=40$
So, the first group in more than cumulative frequency distribution is always equal to $\sum f$