If P(A) = 0.72, what is P(A')?

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Guest Oct 22, 2014

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Best Answer

A' is the complement of A; which means that if A is true, A' is false, and if A is false, A' is true.

A and A' cover all possibilities, with no overlap.

Thus P(A) + P(A') = 1.00.

So if P(A) = 0.72, P(A') = 1.00 - P(A) = 1.00 - 0.72 = 0.28.

geno3141 Oct 22, 2014

geno3141 · Answer 1 · 2014-10-22T02:11:07

A' is the complement of A; which means that if A is true, A' is false, and if A is false, A' is true.

A and A' cover all possibilities, with no overlap.

Thus P(A) + P(A') = 1.00.

So if P(A) = 0.72, P(A') = 1.00 - P(A) = 1.00 - 0.72 = 0.28.

Melody · Answer 2 · 2014-10-22T03:05:43

thanks Geno, I haven't seen that notation.

This is the notation that I know as the complement of A

$$P(\bar A)$$