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Probability

KS3 Maths Foundation Questions – Probability

1) If I have a spinner with two 3s, three 1s and a 2 on what is the possibility of getting a

a) 3

b) 1

c) 2

2) The probability of getting a 3 on an unfair dice is 0.4, what is the probability of not getting a 3?

3) The probability of getting a green car from a random draw is 0.35.

a) What is the probability of not getting a green car?

b) If also the probability of getting a red car from the same draw is 0.4 what is the probability of getting neither red or green?

c) What is the probability of getting a red or a green car?

4) What is the probability in words of winning a lotto draw if the number of entries is:

a) 5000

b) 20000

c) 1 million

KS3 Maths Higher Questions – Probability

1) The probability of getting a 3 on an unfair dice is 0.4, what is the probability of not getting a 3?

2) The probability of getting a green car from a random draw is 0.35.

a) What is the probability of not getting a green car?

b) If also the probability of getting a red car from the same draw is 0.4 what is the probability of getting neither red or green?

c) What is the probability of getting a red or a green car?

3) A spinning disc is evenly split into 3 section, blue, black and brown.

a) Assuming its fair what is the probability of landing on blue?

b) Assuming its fair if spun 60 times how many times would it land on black?

c) Explain why your answer to part b may not come to pass?

4) The below table shows the outcomes when a 6-sided dice is thrown alongside an 8-sided dice

a) Complete the table

b) How many outcomes are there?

c) Work out the probability of getting a 6

d) Work out the probability of getting 5 but not a 6

e) Work out the probability of not getting a 7 or an 8

f) What is the probability that both dice land on 3?

g) What is the probability that both dice land on an even number?

h) What is the probability that the 6-sidend dice lands on an even number, but the 8-sided dice doesn’t?

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