Independent events (AQA GCSE Maths): Quizzes

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Independent events
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What are independent events?

Events where one doesn't affect the other

What is the multiplication rule for independent events?

P(A and B)=P(A)×P(B)P(A \text{ and } B) = P(A) \times P(B)

A spinner has P(blue)=78P(\text{blue}) = \frac{7}{8} and P(green)=18P(\text{green}) = \frac{1}{8}. Find P(blue then green)P(\text{blue then green}).

764\frac{7}{64}

A spinner has P(blue)=78P(\text{blue}) = \frac{7}{8}. What is P(blue twice)P(\text{blue twice})?

4964\frac{49}{64}

What are tree diagrams used for in probability?

To show probabilities visually

In a tree diagram, how do you find the probability of a specific sequence of events?

Multiply along the branches

When do you add probabilities in a tree diagram?

For multiple ways to get same result

When should you multiply probabilities?

When events happen 'and' together

Aidan's P(score)=0.3P(\text{score}) = 0.3, Chloe's P(score)=0.4P(\text{score}) = 0.4. Find P(exactly one scores)P(\text{exactly one scores}).

0.460.46

What should probabilities on branches from the same point add up to?

11

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