California Assessment of Student Performance and Progress (CAASPP) Math Practice Exam

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If the probability of an event is 0.2, what is the probability of the event not occurring?

  1. 0.1

  2. 0.2

  3. 0.5

  4. 0.8

The correct answer is: 0.8

When determining the probability of an event not occurring, we can use the complementary probability rule. This rule states that the probabilities of an event occurring and not occurring must sum to 1. Given that the probability of the event occurring is 0.2, to find the probability of it not occurring, we subtract this value from 1. So, 1 - 0.2 = 0.8. This calculation shows that if the event has a 20% chance of happening, it has an 80% chance of not happening. Thus, the probability of the event not occurring is indeed 0.8.

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