Unit 10 Section 1 : Basic Probability of One Event
This section covers finding the probability of individual events when an experiment has several equally likely outcomes.
Practice Questions
Work out the answer to each of these questions then click on the button marked
to see whether you are correct.
Practice Question 1
A tube of sweets contains 10 red sweets, 7 blue sweets, 8 green sweets and 5 orange sweets.
If a sweet is taken at random from the tube, what is the probability that it is:
(a) red
(b) orange
(c) green or red
(d) not blue
Practice Question 2
Nine balls, each marked with a number from 1 to 9, are placed in a bag and one
ball is taken out at random. What is the probability that the number on the ball is:
(a) odd
(b) a multiple of 3
(c) a 5
(d) not a 7
Exercises
Work out the answers to the questions below and fill in the boxes. Click on the
button to find out whether you have answered correctly. If you are right
then will appear and you should move on to the next
question. If appears then your answer is wrong. Click
on to clear your original answer and have another go.
If you can't work out the right answer then click on
to see
the answer.
Most of the questions below have fractions as answers.
Put the numerator in the top box and the denominator in the bottom box, like the one shown here:
All fractions in your answers must be simplified (cancelled down).
 

You have now completed Unit 10 Section 1
Since these pages are under
development, we find any feedback extremely valuable. Click
here to fill out a very short form which allows you make comments about
the page, or simply confirm that everything works correctly.

Return to the Y8 Tutorials Menu
Produced by A.J. Reynolds August 2007
