Mathematics for IGCSE & O level - Probability (Section 3 - No. 32)
The probability of a certain event occurring is 0.1. What is the probability of the event *not* occurring?
0.1
0.9
1.0
0.0
Giải thích
The probability of not happening = 1 - the probability of happening = 1 - 0.1 = 0.9