If the probability of passing an examination is 0.8 what is the probability of failing the same examination
The probability of passing and failing are complementary events, which means that if the probability of passing is 0.8, then the probability of failing is:
Probability of failing = 1 - Probability of passing
Probability of failing = 1 - 0.8
Probability of failing = 0.2
Therefore, the probability of failing the examination is 0.2 or 20%.