CAIE IGCSE Mathematics Core Basic Probability Questions

Practise locating likelihood on the 0-to-1 scale, forming single-event probabilities from counts and completing outcomes with the complement rule.

Syllabus
2028–2030
Topic
C8.1
Level
Core

Exam points

  • write a single-event probability as favourable outcomes divided by the equally likely total
  • complete a probability table by using the fact that all mutually exclusive outcomes sum to 1
  • calculate the probability of a not-event as 1 minus the probability of its complement

Covered syllabus points

C8.1.1 Understand and use the probability scale from 0 to 1.C8.1.2 Calculate the probability of a single event.C8.1.3 Understand that the probability of an event not occurring = 1 – the

C8.1 Introduction to probability question 1

[Maximum number: 1]

Elize, Lily and Marco start a business.

Lily buys 20 rolls of ribbon.

8 are red, 6 are blue, 4 are yellow and 2 are pink.
A roll of ribbon is chosen at random.
On the probability scale, draw an arrow ( ↓ ) to show the probability that this roll is
(a) yellow

Figure for Question C8.1 Introduction to probability question 1 — CAIE IGCSE Mathematics Core

(b) not red

Figure for Question C8.1 Introduction to probability question 1 — CAIE IGCSE Mathematics Core

(c) green.

Figure for Question C8.1 Introduction to probability question 1 — CAIE IGCSE Mathematics Core

C8.1 Introduction to probability question 2

[Maximum number: 2]
Table for Question C8.1 Introduction to probability question 2 — CAIE IGCSE Mathematics Core

360 people go on a school trip to one of four places.
Some of the information is shown in the table.

Question (a)

(a)

Find the probability that

[ 2 ]

Question (i)

(i)

a girl, picked at random, visits the Wildlife centre,

[ 1 ]

Question (ii)

(ii)

a person, picked at random from those visiting the Botanic gardens, is a girl,

[ 1 ]

C8.1 Introduction to probability question 3

[Maximum number: 1]

The probability that it will rain at the wedding is 0.12 .

Find the probability that it will not rain.

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