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The table below shows the distribution of the waiting times for some customers in a ...

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.




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