If an event has two possible outcomes, A and B, and the probability of event A occurring is 0.30, the probability of event B occurring is _________.

Name: If an event has two possible outcomes, A and B, and the probability of event A occurring is 0.30, the probability of event B occurring is _________.
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Question

Quizplus · Accepted Answer

The probability of all possible outcomes must add up to 1. Therefore, if the probability of event A occurring is 0.30, then the probability of event B occurring must be 1-0.30=0.70.

If an Event Has Two Possible Outcomes, a and B