Seventy fertiliser samples were taken, and the nitrogen content of each one was recorded. The cumulative frequency table is shown below.
(i)[3]
Use graph paper to draw a cumulative frequency graph for the data.
(ii)[2]
Estimate the percentage of samples whose nitrogen content is greater than $4.4$.
(iii)[1]
Estimate the median value.
(iv)[5]
Complete the frequency table for these data and sketch a histogram on graph paper.
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