Skill: distributions
Distributions Tutor Help
Compute binomial probabilities, standardize with z-scores, and use the empirical rule and normal tables.
1 Concept recap
The essentials of Discrete & Normal Distributions, on one screen.
1 Concept recap
Binomial
P(X=k) = C(n,k)pk(1−p)n−k; μ = np; σ = √(np(1−p)). Check BINS.
z-scores
z = (x−μ)/σ; x = μ+zσ. Negative z = below the mean.
Normal
Empirical rule 68–95–99.7 applies to normal data only. z-table: Φ(z) = area LEFT of z.
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