(a(i))[4]
Calculate an estimate for the mean.
(a(ii))[2]
Finish the histogram so that it displays the figures in the table.
(b(i))[3]
Draw a cumulative frequency diagram on the grid.
(b(ii)(a))[1]
Use your cumulative frequency diagram to find an estimate of the median.
(b(ii)(b))[1]
Use your cumulative frequency diagram to find an estimate of the lower quartile.