SOLUTION: A girl passed an exam is 0.8 find the probability of failing the exam

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Question 1210344: A girl passed an exam is 0.8 find the probability of failing the exam
Found 2 solutions by ikleyn, MathLover1:
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.

Probability that the girl fails the exam is 1 - 0.8 = 0.2.

It is the complementary event and the complementary probability.



Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

if the probability of passing is 0.8, then the probability of failing is
1+-+0.8+=+0.2