Probability Tree Worksheet Page 2
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1. Emma has 7 pens in a box.
5 of the pens are blue.
2 of the pens are red.
Emma takes at random a pen from the box and writes down its colour.
Emma puts the pen back in the box.
Then Emma takes at random a second pen from the box, and writes down its colour.
(a) Complete the probability tree diagram.
First pen
Second pen
Blue
............
Blue
............
Red
............
Blue
............
............
Red
Red
............
(2)
(b) Work out the probability that Emma takes exactly one pen of each colour from the
box.
........................................
Q19
(3)
(Total 5 marks)
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