Practice
Probability practice
Practise probability at your own pace. Choose a difficulty, try each question on paper or in your jotter, use hints only when you need a start, then show answers to check your work.
Build your confidence
Choose a difficulty and number of questions, write down your working, then reveal answers only when you are ready to check. Hints give a starting point without giving away the answer.
10 practice questions
Current set: Mixed. Show your method for each question before checking answers.
1. A bus is late on 6 out of 50 school days. Estimate the probability that it is late on a randomly chosen school day.
Bus punctuality
Late days 6 School days 50 2. A probability is 0.5. Which likelihood word best describes it?
Probability scale
0 impossible0.5 even chance1 certainProbability = 0.5
3. Which is more likely: an event with probability 0.75 or one with probability 45?
Probability comparison
0 impossible0.5 even chance1 certain0.75 compared with 4/5
4. A bag has 6 red counters and 7 blue counters. What is the probability of picking a red counter?
Counter bag
Red 6 Blue 7 Total 13 5. A fair spinner has 3 equal colours and a second fair spinner has 5 equal symbols. What is the probability of getting the named colour and the named symbol?
Independent events
Colour outcomes 3 Symbol outcomes 5 6. The probability that a bus is late is 0.1. What is the probability that it is not late?
Probability complement
0 impossible0.5 even chance1 certainP(late) = 0.1
7. A promotion has probability 0.15 of being used by a customer. Out of 100 customers, how many would you expect to use it?
Expected frequency
Probability 0.15 Customers 100 8. A spinner has 10 equal sections. 2 are yellow. What is the probability of not landing on yellow?
Spinner sections
Yellow 2 Not yellow 8 Total sections 10 9. A weather app gives the chance of rain as 0.8. Write this as a percentage.
Chance of rain
0 impossible0.5 even chance1 certainP(rain) = 0.8
10. A bus is late on 12 out of 60 school days. Estimate the probability that it is late on a randomly chosen school day.
Bus punctuality
Late days 12 School days 60
Practice answers
Check your work when you are ready.