(a)     Illustrate this information on a Venn diagram.

(b)     Find the probability that a randomly selected student from this class is studying both Biology and History.

(c)     Given that a randomly selected student studies Biology, find the probability that this student also studies History.

(a)

     A1A1

Note: Award A1 for a diagram with two intersecting regions and at least the value of the intersection.

(b)     $\frac{9}{{20}}$     A1

(c)     $\frac{9}{{12}}\left( { = \frac{3}{4}} \right)$     A1

[4 marks]

Although this was the best done question on the paper, it was disappointing that a significant number of candidates produced Venn diagrams with key information missing.