2 A company asked their employees how long they took to travel to work one day. The table summarises the times for 120 employees. (a) (i) Complete the cumulative frequency table below. (ii) On the grid, draw a smooth cumulative frequency curve to represent these results. (b) Use your curve to estimate (i) the median time, (ii) the interquartile range of the times. (c) Calculate an estimate of the mean time taken for the employees to travel to work.