Independent events (Edexcel GCSE Maths): Flashcards

Outcome of one event doesn't affect outcome of another

$P(A) \times P(B)$

Only when events are truly independent

Add up to 1

Multiply along the branches

Add up the individual probabilities

$\frac{7}{8} \times \frac{1}{8} = \frac{7}{64}$

$\frac{7}{8} \times \frac{7}{8} = \frac{49}{64}$

For 'and' - finding combined events happening together

For 'or' - finding multiple possible outcomes

One outcome gives no info about the other

Coin flips - first result doesn't affect second