Missing probabilities from a spinner

Sample Missing probabilities from a spinner questions

A few of the 5 questions, from easier to harder. Choose your exam board and tier to practise them, with every answer marked.

1. Question 14 marksGrade 4-5
   Here is a 4-sided spinner, numbered 1 to 4. The table shows the probabilities that when the spinner is spun it will land on some of the numbers.

   Number	1	2	3	4
   Probability	0.2		0.4	0.1

   The spinner is spun once. (a) Work out the probability that the spinner will land on 2. (b) Which number is the spinner least likely to land on? The spinner is going to be spun 60 times. (c) Work out an estimate for the number of times the spinner will land on 1.
   Show the worked solution

   (a) All probabilities sum to 1: $0.3 = 1 - (0.2 + 0.4 + 0.1) = 0.3$

What are the common mistakes in Missing probabilities from a spinner?

When a pupil makes one of these on Revision Workshop, the marking engine names the mistake and explains it, instead of just marking the answer wrong.

• Gave sum instead of complement

  Gave the sum of the known probabilities rather than subtracting that sum from 1 to find the missing probability.

Quick answers about Missing probabilities from a spinner

How many Missing probabilities from a spinner practice questions are there?

There are 5 self-marking GCSE Maths questions on Missing probabilities from a spinner, written for AQA, Pearson, OCR across Foundation and Higher tier. Each one is marked instantly and has a full worked solution.

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