If the probability of success is 0.2, what is the probability of failure?

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Multiple Choice

If the probability of success is 0.2, what is the probability of failure?

Explanation:
Complementary probability: in a binary outcome, the two possible results must cover all possibilities and sum to 1. If the chance of success is 0.2, the chance of the opposite outcome (failure) is 1 − 0.2 = 0.8. So the probability of failure is 0.8. The other options don’t fit because they either repeat the success probability (0.2) or imply different overall totals (0.4 or 0.0) that don’t align with a complete, two-outcome scenario.

Complementary probability: in a binary outcome, the two possible results must cover all possibilities and sum to 1. If the chance of success is 0.2, the chance of the opposite outcome (failure) is 1 − 0.2 = 0.8. So the probability of failure is 0.8. The other options don’t fit because they either repeat the success probability (0.2) or imply different overall totals (0.4 or 0.0) that don’t align with a complete, two-outcome scenario.

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