9709 P61 - Nov 2014 - Q3
2619
Jodie tosses a biased coin and throws two fair tetrahedral dice. The probability that the coin shows a head is \(\frac{1}{3}\). Each of the dice has four faces, numbered 1, 2, 3, and 4. Jodie’s score is calculated from the numbers on the faces that the dice land on, as follows:
- if the coin shows a head, the two numbers from the dice are added together;
- if the coin shows a tail, the two numbers from the dice are multiplied together.
Find the probability that the coin shows a head given that Jodie’s score is 8.
