Probability Distributions

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# Description

Compute probabilities and plot the probability mass function for the binomial, geometric, Poisson, hypergeometric, and negative binomial distributions. Compute probabilities, determine percentiles, and plot the probability density function for the normal (Gaussian), t, chi-square, F, exponential, gamma, beta, and log-normal distributions.

Some knowledge of probability distributions is required! If you don't know what a "binomial" distribution is, for example, this application will not be useful to you.

Some knowledge of probability distributions is required! If you don't know what a "binomial" distribution is, for example, this application will not be useful to you.

My review

Review from

# Reviews

4.6

919 total

5 706

4 145

3 37

2 13

1 18

Surekha Kunigiri

Easy to understand.. I like it

William Hanlon

Very useful to quickly calculate chi squared p-values or to settle lunchtime debates about the Poisson probability of background fluctuating up to observed signal.

Renan P. Jenie

It works! Missing z score, but easy enough to compute anyway :)

Paul Long

The best... No strange access needed. Free, and much easier to use than Excel. It's been a boon for my stats classes to the point where I've recommended it to other students.

Daniel V

I needed an app that could calculate the Q-function and its inverse. This is it. Only thing that could possibly make it better would be overlaying several distributions at once.

devendra mishra

Gatiya hai ye Bahut slow h

User reviews

It works! Missing z score, but easy enough to compute anyway :)

Great app This app is very easy and very fast. Everything's is vvvvvvgood

A scholar production for laymen's. It helped me to understand something that I cudnt get it from many things

one I hit the formulas button it shows em very fast and I can't read a single word

Matthew Bognar November 23, 2016

It takes a couple of seconds for the formulas to render on your device. Be patient. Matthew Bognar January 20, 2017

Why? Did you encounter a bug? This app took about 1 year to develop. More useful feedback would be appreciated. This app is a masterpiece and serves you as a key for almost everything.

Great App Simple UI and very useful to check answers

This is the only probability calculator I've found that has a normal distribution calculator with the necessary amount of precision required for my actuary exams! It can calculate normal and inverse normal, a feature which I've also not been able to find elsewhere. Bonus points for including graphs and formulas for all the distributions available! Graphics are nice and layout is intuitive. No complaints here! Very well done :-)

woah just wanted to calculate a simple thing but then this app has all sorts of formulas and symbols that I do not understand. 😞😞. But it seems useful to those who understand it so I give it 5 stars.

Review deleted

# What's New

Added Pareto distribution.

# Additional information

Updated

June 30, 2017

Installs

100,000 - 500,000

Current Version

5.5

Requires Android

4.1 and up

Permissions

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Matthew Bognar

Developer

Visit website Email mattbognar@gmail.com

Department of Statistics and Actuarial Science
University of Iowa