A company carried out a survey asking staff how long they spent travelling to work on one day. The table below summarises the times for 120 employees.
(a(i))[1]
Fill in the cumulative frequency table.
(a(ii))[2]
On the grid, sketch a smooth cumulative frequency curve to show these results.
(b(i))[1]
Use your curve to estimate the median time.
(b(ii))[2]
Use your curve to estimate the interquartile range of the times.
(c)[3]
Calculate an estimate of the mean time taken for the employees to travel to work.
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