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CSS Statistics QUESTION #1960
Question 1
If \(P(A)\) is the probability of event A, which expression correctly gives the probability of its complement \(A^c\)?
  • \(1 + P(A)\)
  • \(1 - P(A)\)✔️
  • \(P(A)\)
  • \(P(A) - 1\)
Correct Answer Explanation
By the complement rule of probability, \(P(A^c) = 1 - P(A)\). Since \(P(A) + P(A^c) = 1\), the complement probability is always \(1 - P(A)\).