About this app

This app offers the option of entering data sets from an empirical sample or data with corresponding probabilities. Depending on the specifications, the mean and empirical variance or expected value and variance with standard deviation are calculated step by step. Probability can be entered as decimal numbers. The sample of data can be entered as natural numbers. The solution is shown step by step. All calculations are stored in the history. The final solution can be shared. [ Contents ] - important statistical values for a sample of data with corresponding probabilities are calculated - x as data or P(X) as probabilitie must be entered - mean, empirical variance, standard deviation are calculated - or expected value, variance, standard deviation are calculated - results are calculated and shown in detail - history to save the input - detailed solution - natural or decimal numbers are supported - no ads! [ Usage ] - there are fields for entering values using a special keyboard - touching the plus button on the bottom of the table adds a new row to enter more data - press the check mark button at the bottom right to start the calculation - if values are missing, the corresponding field is highlighted in yellow - if the values are incorrect, the affected field will be highlighted in red - a short message explains why a value is incorrect - the entries in the history can be deleted or sorted - if you select an entry in the history, it will be automatically loaded for the calculation - the whole history can be deleted by pressing a button - solutions can be shared - the sum of probabilities P(X) must be equal to 1.0

Latest release

What’s New

Version 2.2.4 Aug 14, 2026

The latest release 'Least common multiple' is linked in the menu section now. Minor performance and UI fixes.

Audience growth

Ratings growth

Steady

7-day gain +0

Ratings / day 0.0

30-day gain +0

US rating-count history

0 ratings

Baseline captured. Growth appears after the crawler observes a changed rating count.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

Price tracking