Statistics and Probability
Mean: Sum ÷ count. Median: Middle value (ordered list). Mode: Most frequent. Range: Max − min.
Finding a missing value: Total = mean × count. Subtract known values.
Probability: P(event) = favorable outcomes / total possible outcomes. Range: 0 to 1.
Factorial: n! = n × (n−1) × ... × 1. Example: 5! = 120.