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

- Mathematics (cumulative frequency -
**Reiny**, Wednesday, June 17, 2009 at 1:45pm
look at the last two columns

first row: no. of students =4, so current sum=4

second row: no. of students = 7, sum of students = what it was in the last row + number of students

= 4+7 = 11

third row: no. of students = 11

sum = 11+11=22

fourth row: (your first ?)

no. of students = 18

new sum = 22+18 = 40

Can you follow my steps?

now continue down for the rest of the chart.

Don't make any arithmetic errors, once you mess up, all answers after that will be wrong.

- Mathematics (cumulative frequency -
**sarah**, Tuesday, June 4, 2013 at 5:20pm
this is the most awefull explenation of cumulative frequence...... ever!!!!!!!

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