(a)[4]
Calculate an estimated mean. Give your answer correct to 1 decimal place.
(b)[3]
Calculate the height of the bar for each interval below: $115 < h \leq 125$, $110 < h \leq 115$, $70 < h \leq 90$.
(c)[2]
Complete the cumulative frequency table below.
(d)[3]
On the grid opposite, draw a cumulative frequency diagram.
(e(i))[2]
Use your cumulative frequency diagram to find an estimate of the interquartile range.
(e(ii))[2]
Use your cumulative frequency diagram to find an estimate of the 70th percentile.
(e(iii))[2]
Use your cumulative frequency diagram to find an estimate of the number of children with height greater than 106 cm.