Mathematics for IGCSE & O level - Probability (Section 4 - No. 1)
If the probability of an event occurring is 0.25, what is the probability of that event *not* occurring?
0.25
0.5
0.75
1.0
解释
The probability of an event not occurring is 1 minus the probability of the event occurring. Therefore, 1 - 0.25 = 0.75