Probability Distributions is a free Android app developed by Madiyar Aitbayev that falls under the Education & Reference category. The app provides users with an extensive list of continuous and discrete probability distributions, including Normal, Chi-Squared, Binomial, Poisson, and many more.

The app allows users to calculate confidence intervals for both the middle and the upper and lower tails. For instance, if you want to determine the 95% confidence interval of a Normal Distribution, you can select the Normal distribution, choose the middle option, and enter 0.95 on the right side of the probability values. The app will automatically provide you with the From and To values, 1.96 in this case).

The app is easy to use, well-structured, and provides accurate results. Moreover, the app is available for beta testing on iOS via TestFlight. If you are looking for a comprehensive tool for probability calculations, Probability Distributions is the app for you.