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2.3 Probability

2.3 Probability

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Question 154
a.

Two events EEE and FFF satisfy P(E∩F)=0P(E \cap F) = 0P(E∩F)=0. State the technical term used to describe the relationship between these two events.

[1]
b.

A diagnostic test uses two separate chemical indicators, Alpha (AAA) and Beta (BBB), to detect a specific enzyme. Indicator AAA activates independently of indicator BBB.

The probability that indicator AAA activates is 34\frac{3}{4}43​. The probability that at least one of the indicators activates is 1720\frac{17}{20}2017​.

Determine:

P(B)P(B)P(B)

[2]
c.

P(A∩B′)P(A \cap B')P(A∩B′)

[2]
d.

P(A′∣B)P(A' | B)P(A′∣B)

[2]
Markscheme

2.3 Probability Questions

  1. A Level
  2. /Maths
  3. /2.3 Probability

200 exam-style questions on OCR A Level Maths 2.3 Probability, covering 2.3.1 Mutually exclusive and independent events, 2.3.2 Diagrams to assist probability calculations, 2.3.3 Conditional probability (A-level only), 2.3.4 Conditional probability from first principles (A-level only), and 2.3.5 Modelling with probability. Each one has a worked solution and a mark scheme showing where the marks go.

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