The figures below show to t he nearest minute 80 students waited to be served in a canteen.

Question

Waiting time No. of students .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

Answer 1

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.

Answer 2

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

Answer 3

27278