Conditional probability (AQA GCSE Statistics): Flashcards
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Practise the cards
10 cards from this deck
What does P(A|B) represent in probability?
What does P(A|B) represent in probability?
Probability of A occurring given B has happened.
How do you find P(B|A) using a Venn diagram?
How do you find P(B|A) using a Venn diagram?
Use overlap of A and B divided by total A probability.
What is the probability of drawing a black bead second?
What is the probability of drawing a black bead second?
Depends on the first bead drawn; calculate accordingly.
What is the multiplication rule in probability?
What is the multiplication rule in probability?
P(A and B) = P(A) × P(B|A) for dependent events.
How to find P(A|B) from a Venn diagram?
How to find P(A|B) from a Venn diagram?
P(A|B) = P(A and B) / P(B) using relevant sections.
What happens to probabilities in sampling without replacement?
What happens to probabilities in sampling without replacement?
Events become dependent; previous outcomes affect next.
Calculate P(B|A) given P(A) = 0.4, P(A and B) = 0.1.
Calculate P(B|A) given P(A) = 0.4, P(A and B) = 0.1.
P(B|A) = 0.1 / 0.4 = 0.25 or 1/4.
What is the total probability of A in a Venn diagram?
What is the total probability of A in a Venn diagram?
Sum probabilities of only A and both A and B.
How to simplify fractions in probability answers?
How to simplify fractions in probability answers?
Divide numerator and denominator by their GCD.
Why is 'given' important in probability questions?
Why is 'given' important in probability questions?
'Given' indicates conditional probability is needed.