(a)[4]
On the grid, sketch a box-and-whisker plot to represent the information shown in the cumulative frequency diagram.
(b(i))[2]
Use the cumulative frequency diagram to obtain an estimate of the 30th percentile.
(b(ii))[2]
Use the cumulative frequency diagram to estimate how many boys have a mass greater than 75 kg.
(c(i))[1]
Complete this table.
(c(ii))[4]
Calculate an estimated mean mass for the boys.
(c(iii))[3]
Find the probability that one has a mass greater than 80 kg and the other has a mass of 80 kg or less.