The image above represents P(not A).
To compute for P(not A), two essential parameters are needed and these parameters are Number of Times in Which Event A Can Occur (x) and Total Number of All Possible Outcomes (N).
The formula for calculating P(not A):
P(not A) = (N – x) ⁄ N
Where;
x = Number of Times in Which Event A can Occur
N = Total Number of All Possible Outcomes
Let’s solve an example;
Find the P(not A) when the number of times in which event A can occur is 7 and the total number of all possible outcomes is 11.
This implies that;
x = Number of Times in Which Event A can Occur = 7
N = Total Number of All Possible Outcomes = 11
P(not A) = (N – x) ⁄ N
P(not A) = (11 – 7) ⁄ 11
P(not A) = 4 ⁄ 11
P(not A) = 0.36
Therefore, the P(not A) is 0.36.
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