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

The video tutorial explains how to analyze a probability tree diagram involving a biased six-sided dice. It highlights the importance of ensuring that the probabilities on the branches add up to one. The tutorial identifies errors in the diagram, such as incorrect probability values and branches not summing to one. The video emphasizes the need to maintain consistent probabilities throughout the diagram and provides examples of common mistakes.

What is the probability of landing on a four with the biased dice?

• 0.65

• 0.50

• 0.25

• 0.75

What should the sum of probabilities on each branch of a probability tree diagram be?

• 2

• 0.5

• 1

• 1.5

What was the incorrect sum of probabilities on the branches in the diagram?

• 0.8

• 0.9

• 1.0

• 1.1

What was the incorrect probability of landing on a four in the tree diagram?

• 0.55

• 0.45

• 0.35

• 0.25

How many errors were identified in the probability tree diagram?

• 1

• 2

• 4

• 3