Ks3 Mathematics 10-4-10 Level 5 Answer Booklet Page 31
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31DAY 10
Coins
(a)
Jo has these 4 coins.
Jo is going to take one of these coins at random.
Each coin is equally likely to be the one she takes.
1
Show that the probability that it will be a 10p coin is
2
Out of 4 coins, 2 are 10p’s so probability of a 10p coin is
2 = 1
1 mark
4
2
(b)
Colin has 4 coins that total 33p.
He is going to take one of his coins at random.
What is the probability that it will be a 10p coin?
Write down
You must show your working.
what the 4
coins are
20p, 10p, 2p, 1p
¼
This time 1 of the 4 coins is 10p so probability of a 10p coin is
Do not use words such as “2
out of 4” or “1 in 4” for your
answers
31
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