Edexcel IGCSE Math A 6.3.H complement of an event

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

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

Helga is going to play the game another 60 times.

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6.3.H Complementary events question 1