Question

If S is the event that it will rain tomorrow and P(S) = 0.3. Find P(S').

• A. 0.3
• B. 0.5
• C. 0.7
• D. 1

Answer 1

The correct option is C

0.7

P(S) and P(S') are complementary events.

Given, P(S) is the probability that it will rain tomorrow. So, P(S') will be the probability that it will not rain tomorrow.

P(S) + P(S') = 1

$\Rightarrow$ 0.3 + P(S') = 1

$\Rightarrow$ P(S') = 0.7