The lengths of 90 leaves of a plant were measured. The results are given in the table. Length (t cm) 0<t≤1 1<t≤2 2<t≤3 3<t≤4 4<t≤5 5<t≤6 Frequency 7 17 29 24 10 3 The diagram shows part of the cumulative frequency curve. [Figure 17]

1. (a)Complete the cumulative frequency curve.[1]
2. (b)(i)Use the curve to estimate the median,[1]
3. (b)(ii)Use the curve to estimate the number of leaves with a length less than 3.5 cm.[1]

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