Statistics

Average Calculator

Calculate the arithmetic average of a list of numbers as sum divided by count.

Calculate the arithmetic mean of a comma-separated list of values.

Calculate the mean of a comma-separated number list.

Calculate combinations nCr from n and r.

Calculate probability percent from favorable and total outcomes.

Calculate z score from value, mean, and standard deviation.

Calculate sample or population standard deviation from a list of numbers.

Approximate a normal (z) p-value for two-tailed, left-tailed, or right-tailed tests.

Compute a z based confidence interval for a mean from mean, SD, n, and confidence level.

Estimate required sample size for a proportion survey with confidence, margin of error, and optional population size.