Quick questions on Probability: mutually exclusive, independent and conditional events - OCR A-Level Maths A

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is conditional probability?

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Conditional probability is the chance of

A

given that

B

has already happened.

What are tree diagrams for sequences?

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A tree diagram handles a sequence of stages: multiply along the branches for a path, add across paths for an "or". For drawing without replacement, the second-stage probabilities change because the total and the counts have decreased.

What is q1?

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Events

A

and

B

are independent with

P(A) = 0.3

and

P(B) = 0.4

. Find

P(A \cap B)

. [2 marks]

What is q2?

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P(A) = 0.7

P(A \cap B) = 0.28

. Find

P(B \mid A)

. [2 marks]

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