Cumulative Frequency Table Question Part 1
A questionnaire was taken among 45 persons to find out the time taken to shop at a store. The following table shows the results of the questionnaire.
|
Time Taken in minutes |
Number of persons |
|
1-5 |
2 |
|
6-10 |
6 |
|
11-15 |
8 |
|
16-20 |
14 |
|
21-25 |
11 |
|
26-30 |
4 |
a) Construct a cumulative frequency table to represent the data given above.
b) Use the cumulative frequency table to calculate
1) The number of persons who took no more than 20 minutes
2) The number of persons who took more than 20 minutes
3) The probability that a person chosen at random would have taken more than 15 minutes