myStatistics - A handy statistics calculator.
Works just like your calculator you use in your Statistics class, only better.
Input data and see results like:
-The five-number summary (first quartile, median, etc.)
-Weighted average
-Standard deviation
-Variance
-Skewness, and
-Kurtosis
Also provides you with rich charts! A histogram & Normal and Exponential QQ-plots, to provide you instantly with the relevant information that gives meaning to your data.