Question

The probability of an event not happening is 0.95, then the probability of the event happening is ___

• A. 0.5
• B. 0.05
• C. 5.0
• D. 0.25

Answer 1

The correct option is B 0.05

If E and $\overline{E}$(not E) are complementary events, then, we have, P(not E) + P(E) = 1, where P(E) is the probability of the event happening.

Given, the probability of an event not happening is 0.95. Then the probability of the event happening = 1 - 0.95 = 0.05