Standard Deviation Calculator

This tool computes the standard deviation of a numeric dataset to measure how spread out values are around the mean. It is designed for students, researchers, analysts, and professionals who need a quick dispersion summary without programming.
Conceptually, it applies either the sample formula (n-1) or the population formula (n) to squared deviations from the mean, then takes the square root. It ignores non-numeric entries when calculating and reports mean, variance, and the final std dev.
Inputs are a list of numbers, optional mode selection, and decimal precision. Outputs include std deviation, variance, and mean. The tool highlights edge cases such as empty datasets or insufficient sample size and provides precise numeric results.
Use cases include quality control, hypothesis testing groundwork, and data science workflows. Unique value comes from explicit mode control, clear numeric outputs, and the absence of UI requirements, making it suitable for automation, scripting, and quick checks.