Edexcel IGCSE Math A Foundation 6.3 H Complementary Events Questions

Practise complement-probability questions by subtracting the given probability from 1 or using the non-event count directly.

Exam points

Subtract a given probability from 1 to find the probability of the complement.
Use wording such as not white or does not prefer cake to identify the non-event.

[Maximum number: 1]

Eight people play a computer game.
Here are their scores.
7
10
8
9
12
9
10
10

Helga has played the game many times.
She scored 9 or more in $\frac{5}{6}$ of these games.

Work out an estimate for the probability that the next time Helga plays the game she scores less than 9

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