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2.3.2 Diagrams to assist probability calculations

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Question 25

The probability that Sarah travels to her office by train, by bus, or by car is $35\frac{3}{5}$ , $14\frac{1}{4}$ , and $320\frac{3}{20}$ respectively. The probability of being late to work when using these methods of travel is $112\frac{1}{12}$ , $15\frac{1}{5}$ , and $13\frac{1}{3}$ respectively.

Draw a tree diagram to represent this information.

[2]

Find the probability that on a randomly chosen day: (i) Sarah travels by car and is late, (ii) Sarah is not late.

[3]

Given that Sarah is late, find the probability that she did not travel by train.

[3]

Markscheme

2.3.2 Diagrams to assist probability calculations Questions

A Level
Maths
2.3.2 Diagrams to assist probability calculations

26 exam-style questions on OCR A Level Maths 2.3.2 Diagrams to assist probability calculations. Each one has a worked solution and a mark scheme showing where the marks go.

2.3.2 Diagrams to assist probability calculations

Question bank

2.3.2 Diagrams to assist probability calculations

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Question 25

Draw a tree diagram to represent this information.

[2]

Find the probability that on a randomly chosen day: (i) Sarah travels by car and is late, (ii) Sarah is not late.

[3]

Given that Sarah is late, find the probability that she did not travel by train.

[3]

Markscheme

2.3.2 Diagrams to assist probability calculations Questions

A Level
Maths
2.3.2 Diagrams to assist probability calculations

26 exam-style questions on OCR A Level Maths 2.3.2 Diagrams to assist probability calculations. Each one has a worked solution and a mark scheme showing where the marks go.