Mathematics (AS & A Level) · May / June 2026 · Paper 52 · Question 7
9709
As printed in the paper
The question as text
The lengths of the leaves of a certain type of tree are normally distributed with mean n cm and standard deviation v cm. It is known that 20% of the leaves have a length less than 3.60 cm and 70% of the leaves have a length greater than 5.40 cm.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
7(a)[5]
7(b)[4]
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