Calculate probabilities of independent events

Maths

Probability 3 (Tree diagrams)

For the probability tree shown, which calculation will find the probability of red followed by blue happening?

The probability that Amy and Joe win a game of chess is shown in the tree diagram. Work out the probability that over 2 games Amy wins twice.

All probabilities add to 1 on each branch.

It doesn’t matter if he eats the first sweet he takes.

James draws this probability tree diagram to help him calculate probabilities of taking sweets from a bag. What assumptions has James made when completing this probability tree?

Here is the first branch of a probability tree diagram.

Here is the first branch of a different probability tree diagram. What should the missing probability be?

This tree diagram shows Amir taking red and blue counters from a jar. He replaces the counter after he has picked one up.

Calculate probabilities of independent events

Lesson outcome