Paper 22 Q5IGCSE 0580 May/June 2023

Question

5 A spinner is spun. The possible outcomes are A, B, C or D. The probability of spinning A, C or D is shown in the table. Letter on A B C D spinner Probability 0.2 0.05 0.35 Complete the table.

This question tests understanding that all probabilities for a spinner must add up to 1. You need to find the missing probability for outcome B using the fact that the total probability equals 1.

Step-by-Step Solution

Key Takeaway

The sum of all probabilities in any probability situation must always equal 1.

Common Mistakes

Adding all the given probabilities together instead of subtracting from 1, giving 0.6 as the answer
Forgetting that probabilities must sum to 1 and trying to calculate P(B) using ratios or other methods

Exam Tip

Always check your final answer by adding all probabilities together - they should sum to exactly 1.

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