Statistics

Calculate mean, median, mode, and range from the same data set, then compare what each summary actually tells you.

Measure how tightly a data list clusters around its mean, compare population and sample standard deviation, inspect variance, and understand outlier-driven spread.

Calculate a weighted average from values and weights, with examples for grades, credits, portfolio allocations, zero-weight rows, and signed weights.

Count words, characters, paragraphs, reading time, A4 pages, and standard pages from pasted text or local PDF, Word, OpenDocument, spreadsheet, presentation, ebook, subtitle, and text files.