Question 5:
Jenson is going to choose a ball at random from a bag and then flip
a coin.
There are 5 balls in the bag, 2 red and 3 green.
A ball is picked at random from the bag and its colour is recorded.
If the ball is green, a fair coin is flipped.
If the ball is red, a biased coin is flipped, where heads has a
probability of 70%
a) Draw a tree diagram to show this information, in your books.
Jenson selects a ball and flips the appropriate coin.
b) Find the probability that he obtains a tail.