Probability, distributions, confidence intervals, and descriptive statistics
PDF, CDF, and z-score lookup for the normal distribution
Confidence interval for a proportion or mean
Convert between raw scores and z-scores
Count combinations C(n,r) and permutations P(n,r)
AND, OR, conditional probability and basic events
Binomial probability P(X=k), CDF, mean, and variance
Poisson probability for rare events
Min, Q1, median, Q3, max, IQR, and outlier detection
Sample and population std dev, variance, and mean
Calculate margin of error for surveys and polls