Probability Distributions

Madiyar Aitbayev

About this app

Continuous probability distributions:
- Normal (Gaussian)
- t (Student's t)
- Chi-Squared
- F
- Exponential
- Gamma
- Beta
- Log-normal
- Weibull
- Uniform

Discrete probability distributions:
- Binomial
- Poisson
- Pascal (Negative Binomial)
- Geometric
- Hypergeometric
- Discrete Uniform

You can now calculate confidence intervals for "Both", "Middle", "Lower" and "Upper" tails. For example, if you want to find the 95% confidence interval of a Normal Distribution:
1. first select "Normal" distribution and select "Middle"
2. then enter "0.95" on the right side of the probability values
3. From and to values will be automatically calculated for you (-1.96, 1.96 in this case)

Help test the beta version of iOS app https://testflight.apple.com/join/eC4zBt6z

If you like the app, your review ❤️ and 5-⭐s are highly appreciated. Thank you!

Ratings and reviews

Useful since I dont have a graphics calculator, however it isn't super user friendly (no text wrapping for answers, answer goes offscreen for "both tails" mode). I'm just glad there arent that many invNorm or normalCDF questions to study. Overall pretty useful anyway, made my life easier.

OMG! FINALLY! A probability calculator that actually works. Thank you. There are a lot out there that claim to calculate probability and z scores but they dont. This one actually works, though I don't think it figures out z scores, but I know how to do that on my own.

So many distributions and customisation options, very easy to use. Excellent app. Lots of useful features.

What's new

The user interface was flipped from right to left when the system language is a right to left language. This release prevents flipping since the app only supports English language.