# Calculate probabilities of dependent events

In this lesson, we will learn how to calculate probabilities of outcomes for dependent events from tree diagrams

#### Unit quizzes are being retired in August 2023

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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.Probability of a dependent event is also called?

1/3

Q2.Simon has drawn this probability tree for a question on dependent probability. What mistake has he made?

2/3

Q3.This tree diagram shows Amir taking red and blue sweets from a bag. He does not replace the sweet after he has taken one.

3/3

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
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.Probability of a dependent event is also called?

1/3

Q2.Simon has drawn this probability tree for a question on dependent probability. What mistake has he made?

2/3

Q3.This tree diagram shows Amir taking red and blue sweets from a bag. He does not replace the sweet after he has taken one.

3/3

# 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.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Calculate probabilities of dependent events

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

Q1.Amy is going to pick 2 biscuits from a box. Some are chocolate and some are plain. The probability tree shows the probability information.

1/3

Q2.James is also going to pick 2 biscuits from a box. Some are chocolate and some are plain. The probability tree shows the probability information.

2/3

Q3.Here is a probability tree showing Amir taking red and blue sweets from a bag.

3/3

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Calculate probabilities of dependent events

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

Q1.Amy is going to pick 2 biscuits from a box. Some are chocolate and some are plain. The probability tree shows the probability information.

1/3

Q2.James is also going to pick 2 biscuits from a box. Some are chocolate and some are plain. The probability tree shows the probability information.

2/3

Q3.Here is a probability tree showing Amir taking red and blue sweets from a bag.

3/3

# Lesson summary: Calculate probabilities of dependent events

## Time to move!

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

For 5 mins...

Move around:
Walk

On the spot:
Chair yoga