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ScotlandApplications of MathematicsQuick questions

Statistics and Probability

Quick questions on Probability and expectation - SQA Higher Applications of Maths

3short 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 q1?
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A fair die is rolled twice. Find the probability of two sixes. [2 marks]
What is q2?
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P(A)=0.5P(A) = 0.5, P(B)=0.4P(B) = 0.4, P(A and B)=0.1P(A \text{ and } B) = 0.1. Find P(A or B)P(A \text{ or } B). [2 marks]
What is q3?
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A raffle ticket costs £1\pounds 1. It wins £50\pounds 50 with probability 0.010.01 and nothing otherwise. Find the expected profit per ticket.

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