Interactive law-of-large-numbers lab
Run 10, 100, 1,000, or a custom number of independent flips. Compare counts, deviation, streaks, and the cumulative proportion across repeated runs.
Run the experiment more than once to compare normal variation.
CSV files contain only trial results and web-crypto-getRandomValues-v1 (version 1). Read the method and limitations.
The expected probability of Heads is 50% on each trial. A particular run does not have to end at 50%, and the cumulative line can move in either direction along the way. Larger runs usually show a smaller proportional deviation, but exceptions remain possible.
Independent does not mean alternating. The longest-streak value helps make clusters visible; a long run of one side is not, by itself, evidence that the source is biased.
Repeat the same trial count several times. Each row is generated from new browser Web Crypto values, so the table shows how samples of the same size can still differ.
CSV export is created on your device and includes the trial number, outcome, cumulative Heads total and proportion, plus the method identifier and version. It contains no account or label data.
The experiment uses the same shared module as every decision tool. See the full method, source links, test fixtures, and limitations.