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Question

Weight of the students in a class is represented in a grouped frequency table.

Weight
(Kg)
Frequency
(No. of students)
30 - 40 10
40 - 50 7
50 - 60 12
60 - 70 15
70 - 80 9
80 - 90 3
90 - 100 1

What is the Greater than type cumulative frequency of group having 7 frequency?

A
7
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B
47
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C
17
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D
25
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Solution

The correct option is B 47
The progressive sum of the frequencies from the last class to the lower boundary of the particular data class is the Greater than cumulative frequency.

For example :-
Weight
(Kg)
Frequency
(No. of students)
Cumulative Frequency
30 - 40 10 47 + 10 = 57
40 - 50 7 40 + 7 =47
50 - 60 12 28 + 12 = 40
60 - 70 15 13+15 = 28
70 - 80 9 4+9 = 13
80 - 90 3 1+3 = 4
90 - 100 1 1+0 = 1


The progressive sum of the frequencies from the last class 90 - 100 to lower boundary 40 of the particular data class 40 - 50 is 47, so 47 is the Greater than the cumulative frequency of group having 7 frequency.

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