(a(i))[1]
Estimate the median by using the cumulative frequency diagram.
(a(ii))[2]
Estimate the interquartile range from the cumulative frequency diagram.
(a(iii))[1]
Estimate the 60th percentile from the cumulative frequency diagram.
(a(iv))[2]
Use the cumulative frequency diagram to estimate how many plants have a height greater than $40$ cm.
(b(i))[4]
Work out an estimate of the mean height.
(b(ii))[2]
Calculate the height of the bar for the interval $30 < h \le 50$.