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Conditional Probability — OCR GCSE Maths J560
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OCR GCSE Mathematics
Probability
Combined Events
Conditional Probability
OCR GCSE Mathematics · J560
Conditional Probability
What you need to know
Calculate probabilities of independent and dependent combined events using diagrams.
Calculate conditional probability from first principles.
Apply the formula
P
(
A
∩
B
)
=
P
(
A
∣
B
)
P
(
B
)
P(A \cap B) = P(A | B)P(B)
P
(
A
∩
B
)
=
.
Revision notes
1
Conditional Probability
5 key terms
Practise with past papers
Key terms & definitions
Previous subtopic
Addition Law
Next section: Statistics
Populations and Samples
P
(
A
∣
B
)
P
(
B
)
Determine independence of events using
P
(
A
∣
B
)
=
P
(
A
)
P(A | B) = P(A)
P
(
A
∣
B
)
=
P
(
A
)
.
