Complement Rule

Complement Rule (complement) is a statistics & probability relationship written as Probability that A does not happen or P(not A) = 1 − P(A). Students use it to solve unknowns when enough values are known.

Write Probability that A does not happen, substitute the known numbers carefully, then simplify. Worked walkthrough: P(rain) = 0.3 P(no rain) = 0.7.

Complement Rule usually appears in statistics & probability units during middle or secondary school. Match difficulty with MathDigits grade worksheets so practice fits the curriculum year.

On this page the worked result is 0.7. Generate a formula worksheet below for more unique practice sets.