Equations to Remember

(12.1) Arithmetic mean:

(12.2) Median position:

(12.3) Range: range = x_max − x_min

(12.4) Interquartile range: IQR = Q₃ − Q₁

(12.5) Standard deviation:

(12.6) Probability of two independent events co-occurring: P(A ∩ B) = P(A and B) = P(A) × P(B)

(12.7) Probability of at least one event occurring: P(A ∪ B) = P(A or B) = P(A) + P(B) − P(A and B)

(12.8) Slope: