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

The video tutorial explains how to use probability tree diagrams to calculate the probability of winning two games. It covers the importance of ensuring probabilities on branches add up to one, and demonstrates how to combine probabilities using multiplication and addition. The tutorial concludes with a final calculation, emphasizing the straightforward rules of probability.

What is the sum of probabilities on the branches of a probability tree supposed to equal?

• 1.5

• 1

• 2

• 0.5

If the probability of winning Game A is 0.2 and Game B is 0.3, what is the probability of winning both games?

• 0.3

• 0.1

• 0.5

• 0.06

When combining probabilities across a tree diagram, what operation should you use?

• Subtraction

• Addition

• Multiplication

• Division

In a probability tree, when should you add probabilities?

• When calculating the probability of both events happening

• When calculating the probability of either event happening

• When calculating the probability of neither event happening

• When calculating the probability of one event happening

What is the final probability of winning both games if you multiply 0.2 and 0.3?

• 0.5

• 0.06

• 0.1

• 0.3