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 - 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!!!!!!!