7th Grade · Statistics & Probability
Non-Uniform Probability Model
7.SP.C.7
Definition
A probability model in which outcomes have different probabilities. Still valid as long as all probabilities are ≥ 0 and sum to 1.
Examples
- A spinner where P(Red) ≠ P(Blue) ≠ P(Green) ≠ P(Yellow).
- Real-world events are often non-uniform, unlike a fair die or coin.
Key rule
A model is valid whenever probabilities are non-negative and sum to exactly 1.
Memory hook
Not every outcome gets the same shot.