# Frequency trees

In this lesson, we will look at how we can represent combined events as frequency trees.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is the probability I spin 2 blacks?

1/5

Q2.What is the probability that I spin 2 whites or 2 blacks?

2/5

Q3.What is the probability that I get exactly 1 black?

3/5

Q4.What is the probability that I get 1 white and 1 red?

4/5

Q5.What is the probability that I get 2 whites or 2 reds?

5/5

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is the probability I spin 2 blacks?

1/5

Q2.What is the probability that I spin 2 whites or 2 blacks?

2/5

Q3.What is the probability that I get exactly 1 black?

3/5

Q4.What is the probability that I get 1 white and 1 red?

4/5

Q5.What is the probability that I get 2 whites or 2 reds?

5/5

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

Quiz:

# Frequency Trees

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.How many boys didn't do their homework?

1/5

Q2.How many girls were there altogether?

2/5

Q3.How many students were there altogether?

3/5

Q4.What is the probability of randomly selecting a student who did their homework?

4/5

Q5.Given that I select a girl, what is the probability that she didn't do her homework?

5/5

Quiz:

# Frequency Trees

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.How many boys didn't do their homework?

1/5

Q2.How many girls were there altogether?

2/5

Q3.How many students were there altogether?

3/5

Q4.What is the probability of randomly selecting a student who did their homework?

4/5

Q5.Given that I select a girl, what is the probability that she didn't do her homework?

5/5

# Lesson summary: Frequency trees

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Jog

On the spot:
Dance