Mathematics for IGCSE & O level - Probability (Section 6 - No. 7)
If the probability of an event occurring is 0.4, what is the probability of the event not occurring?
0.4
0.5
0.6
1.0
คำอธิบาย
The probability of not occurring is 1 - probability of occurring: 1 - 0.4 = 0.6.