National 5 Applications of Mathematics

Probability Answer Sheet

Name: __________________________Date: ___________________________Class: __________________________

Use this sheet to check final answers. Pupils should still show working where needed.

1
A bag has 6 red counters and 4 blue counters. What is the probability of picking a red counter?
Answer: 610
2
Which is more likely: an event with probability 0.6 or one with probability 23?
Answer: 23 is more likely
3
A probability is 0.25. Which likelihood word best describes it?
Answer: Unlikely
4
A table shows pupils choosing sports. What is the probability that a randomly chosen pupil chose swimming?
Answer: 1158
5
A card is chosen from cards numbered 1 to 24. What is the probability of choosing a multiple of 4?
Answer: 624
6
Which is more likely: an event with probability 0.8 or one with probability 23?
Answer: 0.8 is more likely
7
A bag has 2 red counters and 3 blue counters. What is the probability of picking a red counter?
Answer: 25
8
A fair spinner has 2 equal colours and a second fair spinner has 5 equal symbols. What is the probability of getting the named colour and the named symbol?
Answer: 110
9
The probability that a bus is late is 0.1. What is the probability that it is not late?
Answer: 0.9
10
A promotion has probability 0.25 of being used by a customer. Out of 120 customers, how many would you expect to use it?
Answer: 30 customers