GCSE Secondary Maths Age 13-17 - Probability & Statistics: Tree Diagram - Explained

The video tutorial explains a probability question involving a tree diagram. It covers how to complete the diagram for a spinner landing on green or red, calculate probabilities for different outcomes, and apply rules for adding and multiplying probabilities. The tutorial emphasizes understanding probability rules and provides a step-by-step guide to solving the problem.

What is the probability that the spinner lands on green during the first spin?

• 0.7

• 0.5

• 0.3

• 1.0

If the probability of landing on green is 0.7, what is the probability of landing on red?

• 0.3

• 0.2

• 0.7

• 0.5

How many possible outcomes are there after two spins of the spinner?

• 5

• 4

• 3

• 2

What is the probability of the spinner landing on green first and then red?

• 0.09

• 0.21

• 0.42

• 0.49

What is the combined probability of the spinner landing on two different colors?

• 0.21

• 0.30

• 0.42

• 0.49

When should you add probabilities in a probability tree diagram?

• When events are certain

• When events are independent

• When events are dependent

• When events are mutually exclusive

What is the rule for calculating the probability of sequential events?

• Add the probabilities

• Subtract the probabilities

• Divide the probabilities

• Multiply the probabilities