# Frequency trees

## Lesson details

### Key learning points

1. 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.

## Video

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## Worksheet

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## Starter quiz

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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

## Exit quiz

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### 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