Mathematics for IGCSE & O level - Probability (Section 2 - No. 3)
If the probability that a student will pass an exam is 0.8, what is the probability that the student will fail?
0.2
0.8
1.0
0.0
คำอธิบาย
The sum of all outcomes must be 1. Therefore 1-0.8 = 0.2