Mathematics (cumulative frequency

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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??? Don't 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 -

    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 -

    this is the most awefull explenation of cumulative frequence...... ever!!!!!!!

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