Question 1 Report
The table below shows the distribution of the waiting times for some customers in a certain petrol station.
|Waiting time (in mins)||No of customers|
|1.5 - 1.9||3|
|2.0 - 2.4||10|
|2.5 - 2.9||18|
|3.0 - 3.4||10|
|3.5 - 3.9||7|
|4.0 - 4.4||2|
(a) Write down the class boundaries of the distribution.
(b) Construct a cumulative frequency curve for the data;
(c) Using your graph, estimate: (i) the interquartile range of the distribution ; (ii) the proportion of customers who could have waited for more than 3 minutes.