Question

What is the probability of an event E not happening if P(E) = 0.2?

• A. 0.2
• B. 0.8
• C. 0.3
• D. 0.6

Answer 1

The correct option is B 0.8

We know that, sum of probabilities of complementary events = 1
i.e.,P(E) + P(not E) = 1

Here, given that p(E) = 0.2
$\Rightarrow$ P(not E) = 1 - P(E)
= 1 - 0.2
= 0.8