Question

Given the probability p=0.84 that an event will not happen, how do you find the probability that the event will happen?

Answer 1

From the definition of probability P we have

P (event does happen) = 1 - P (event does not happen)

P (event does happen) = 1 - 0.84=0.16

Footnote .The probability of an event not happening is also known as the complement of an event happening.