Year 9
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Lesson details
Key learning points
- In this lesson, we will look at how we can represent combined events as frequency trees.
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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5 Questions
Q1.
What is the probability I spin 2 blacks?
16/20
4
4/16
5
Q2.
What is the probability that I spin 2 whites or 2 blacks?
1
4/20
9/25
Q3.
What is the probability that I get exactly 1 black?
1
4/20
8/25
Q4.
What is the probability that I get 1 white and 1 red?
1
12/20
8/20
Q5.
What is the probability that I get 2 whites or 2 reds?
0
1
11/20
5 Questions
Q1.
How many boys didn't do their homework?
13
14
22
Q2.
How many girls were there altogether?
14
29
8
Q3.
How many students were there altogether?
20
55
84
Q4.
What is the probability of randomly selecting a student who did their homework?
1/4
13/20
21/40
Q5.
Given that I select a girl, what is the probability that she didn't do her homework?
13/20
21/42
8/22