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Complementary Event

If PE=0.5, th...

Question

If P(E) = 0.5, then P(not E) = ?
(a) 0.05
(b) 0.95
(c) $\frac{1}{0.05}$
(d) $\frac{1}{0.95}$

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Solution

(b) 0.95

Explanation:
P(E) + P( not E) = 1
∴ P( not E) = 1 − P(E)
⇒ 1 − 0.05 = 0.95

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