Mathematics 0580 · IGCSE · Introduction to probability

Introduction to probability — practice question

Mahir first selects a number at random from 5, 10 and 15. He then selects a number at random from 4, 5 and 6. After that, he adds the two numbers together.
(a)[1]

Complete the sample space diagram.

(b)[2]

Find the probability that one of the chosen numbers is 15.

Worked solution & mark scheme

This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The boxes should contain 9, 10 and 11.” …

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