Year 11
Higher

Year 11
Higher

# Calculate probabilities of dependent events

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## Lesson details

### Key learning points

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

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## Video

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## Worksheet

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## Starter quiz

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### 3 Questions

Q1.
Probability of a dependent event is also called?
Biased probability.
Mutually exclusive.
Random probability.
Q2.
Simon has drawn this probability tree for a question on dependent probability. What mistake has he made?
The fractions on each branch do not sum to 1.
The probabilities should be decimals.
Correct answer: The second part of the probability tree has incorrect probabilities.
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.
A
B
D

## Exit quiz

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### 3 Questions

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.
B
C
D
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.
A
B