Mathematics for IGCSE & O level - Probability (Section 4 - No. 43)

The probability of a certain event occurring is 0.6. What is the probability of this event *not* occurring?

0.2

0.4

0.6

1.0

The probability of an event *not* occurring is 1 minus the probability of the event occurring. 1-0.6 = 0.4