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July 1, 2015

Homework Help: Mathematics (cumulative frequency

Posted by Maggie on Wednesday, June 17, 2009 at 1:37pm.

The figures below show to t he nearest minute 80 students waited to be served in a canteen.
Waiting time No. of students Cum.Freq
1-5 4 4
6-10 7 11
11-15 11 22
16-20 18 ?
21-25 22 ?
26-30 10 ?
31-35 5 ?
36-40 3 ?

How do i find cumulative frequency??? Dont want all the answer just need to know how to find for one, and i will try to find the rest from there

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