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11.2.6 Conditional Probability — OCR Mathematics J560 | GradeGen.AI
Mathematics
Probability
Combined Events
Conditional Probability
Conditional Probability
OCR GCSE Mathematics (J560) — 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
12 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
)
.
