Question

If P(A) and P(A') are complementary events and P(A) = 0.15, then P(A') = ?

• A. 0.35
• B. 0.3
• C. 0.85
• D. Cannot be determined

Answer 1

The correct option is C

0.85

Given, P (A) = 0.15
As, P(A) and P(not A) are complementary events, P(A) + P(not A) = 1.
P (not A) = 1 – P (A) = 1 – 0.15 = 0.85.