Question

If the probability that an event will happen is 0.31, what is the probability of the event's complement?

Answer 1

`0.69`

Explanation:

the complement is the probability that an event will not happen.

since the total probability is `1`, the probability of an event happening, added to the probability of its complement, is always `1`.

the probability of the complement can be found by subtracting the probability of the event from `1`.

`1.00 - 0.31 = 0.69`

`0.69 + 0.31 = 1`
P(event) + P(complement) `= 1`

the probability of the complement is `0.69`.