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Probability basics and sample spacesIB MYP Maths Standard: Mind map

Probability scale
Equally likely outcomes

Probability basics

Chance and sample spaces

0 to 1sample spacenot A
Sample spaces
Not A
Mutually exclusive

Exam questions on Probability basics and sample spaces

  1. A bag at a school fair in Nairobi holds 5 red counters, 3 blue counters and 2 green counters. One counter is taken from the bag at random.
    Find the probability that the counter is red or green. Give a reason why you can add probabilities.2 marks
  2. Two fair four-sided spinners, each numbered 1 to 4, are spun and the two scores are added together.
    Find the probability that the total is at least 7.2 marks
  3. A fair coin is flipped and a fair spinner with three equal sections numbered 1, 2 and 3 is spun.
    List the sample space. Find the probability of getting heads and an odd number.3 marks
See the full worksheet

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).