If the probability that an event will occur is p and the probability that it will not occur is q, which of the following is true?
- p-q=1
- q-p=0
-
p+q=1
- p+q=0
The correct answer is: C
Explanation
The probability that an event will certainly occur + the probability that an event will certainly not occur =
The probability that an event will certainly occur = 1 - the probability that an event will certainly not occur
The probability that an event will certainly not occur = 1 + The probability that an event will certainly occur
Option C is true.