Quick questions on Probability of single and combined events explained: O-Level E-Maths

5short 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 probability of a single event?

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For equally likely outcomes, the probability of an event is the number of favourable outcomes over the total number of outcomes:

What is probabilities outside 0 to 1?

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Any probability must lie between

0

and

1

; a value above

1

signals an error.

What is q1?

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A fair die is rolled. Find the probability of scoring a

5

. [1 mark]

What is q2?

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P(A) = 0.4

and

P(B) = 0.25

for mutually exclusive events. Find

P(A \text{ or } B)

. [1 mark]

What is q3?

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Two independent events each have probability

\dfrac{1}{3}

. Find the probability that both occur. [2 marks]

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