Worksheet: Probability
Name:_____________________
Date:___/___/______
Class:__________
1. There are 7 Red and 3 Blue marbles in a bag. One marble is chosen at random and replaced. Then another marble
is chosen at random. Complete the tree diagram to answer the questions.
R
R
B
R
B
B
(1)
(a)
Complete the tree diagram
(b)
Find the probability of getting two marbles of the same colour
(2)
(c)
Find the probability of getting a red marble
(2)
2. A bag contains 12 sweets. Of these 8 are red, 2 are blue and 2 are green. A sweet is chosen at random and eaten.
Then another sweet is taken.
(a)
Complete the tree diagram
(b)
Find the probability of getting at least 1 red sweet.
(2)
(3)
(c)
Find the probability of getting sweets of different colour.
(3)
Score: ___/13 GRADE: ___/___
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