(a)[4]
Calculate a mean time estimate.
(b(i))[2]
Complete the cumulative frequency table.
(b(ii))[3]
On the grid, draw a cumulative frequency diagram to display this information.
(b(iii)(a))[1]
Use your diagram to estimate the median.
(b(iii)(b))[2]
Use your diagram to estimate the inter-quartile range.
(b(iii)(c))[2]
Use your diagram to estimate the 60th percentile.