Statistics

Mean, Median & Mode Calculator Paste a list of numbers and get the mean, median, mode, range and totals in your browser. Standard Deviation Calculator Calculate sample and population standard deviation and variance, with every step shown. Sample Size Calculator Find how many answers a survey needs for a given confidence level and margin of error. Z-Score Calculator Calculate the z-score and corresponding percentile from a value, mean and standard deviation. Confidence Interval Calculator Compute the confidence interval for a population mean from the sample mean, standard deviation and sample size. Random Sample Generator Draw a random sample of numbers from a population — with or without replacement, sorted for easy use.