(a(i))[3]
On the grid, construct the cumulative frequency diagram.
(a(ii)(a))[1]
Use your cumulative frequency diagram to obtain an estimate of the median.
(a(ii)(b))[2]
Use your cumulative frequency diagram to obtain an estimate of the interquartile range.
(a(ii)(c))[2]
Use your cumulative frequency diagram to estimate how many cars have a speed greater than $110\ \text{km/h}$.
(b(i))[4]
Calculate an estimate for the average mass of the trucks.
(b(ii))[3]
Calculate the heights of the other three blocks.