Question

Weight (in Kg) of the students in a class is represented in a grouped frequency.

Weight (Kg)	Frequency (No. of students)
30 - 40	20
40 - 50	5
50 - 60	16
60 - 70	22
70 - 80	19
80 - 90	13
90 - 100	10

What is the less than type cumulative frequency of group having frequency equals to 13?

• A. 13
• B. 85
• C. 95
• D. 105

Answer 1

The correct option is C 95

The progressive sum of the frequencies from the first class to the upper boundary of the particular data class is the less than cumulative frequency.

For example :-

Weight (Kg)	Frequency (No. of students)	Cumulative Frequency
30 - 40	20	20+0 = 20
40 - 50	5	20+5 =25
50 - 60	16	25+16 = 41
60 - 70	22	41+22 = 63
70 - 80	19	63+19 = 82
80 - 90	13	82+13 = 95
90 - 100	10	95+10 = 105

The progressive sum of the frequencies from the first class 30-40 to upper boundary 80 of the particular data class 80-90 is 95.

Hence, 95 is the less than cumulative frequency of group having frequency equals to 13.