Year 11
Core
Calculate probabilities of dependent events
Year 11
Core
Calculate probabilities of dependent events
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Lesson details
Key learning points
- In this lesson, we will learn how to calculate probabilities of outcomes for dependent events from tree diagrams
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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.
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
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
D
Q3.
Here is a probability tree showing Amir taking red and blue sweets from a bag.
P(B,B)
P(R,B)
P(R,R)