# Probability-Distributions

> Education

Canonical page: [https://chrome-stats.com/d/id889106396](https://chrome-stats.com/d/id889106396)

## Overview

- **ID:** `id889106396`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Matthew Bognar
- **Category:** Education
- **Rating:** 4.90 / 5 (193 ratings)
- **Version:** 0.9.3
- **Last updated:** 2025-07-13
- **First published:** 2014-06-22
- **Size:** 2.35 MB
- **Data as of:** 2026-09-05
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/probability-distributions/id889106396)
- **Privacy policy:** [https://homepage.divms.uiowa.edu/~mbognar](https://homepage.divms.uiowa.edu/~mbognar)

## Description

Probability-Distributions is an educational tool for learning statistics. It lets you compute probabilities, approximate percentiles, and plot probability density functions (PDFs) for a wide range of continuous distributions, including normal, t, chi-square, F, exponential, gamma, beta, log-normal, Pareto, and Weibull. 

For discrete models, it supports binomial, geometric, hypergeometric, Poisson, and negative binomial distributions, showing probabilities and PMFs to aid intuition and coursework.

## Rankings

- #103,492 — Overall

## Review summary

Overall, users praise Probability-Distributions for being free, easy to use, and graphically oriented, with broad coverage of distributions and quick calculations. They value raw-data input for hypothesis testing and confidence intervals, plus easy access to formulas for mean and variance. The app is especially helpful for budget-conscious students. The main drawback is that some professors prohibit using it on exams, limiting classroom applicability. In short, a focused, practical tool with strong visualization and accessible design.

### Pros

- Free access to advanced probability functions (e.g., binomial pdf) without paying for a calculator
- Easy to use with a clean, user-friendly UI
- Includes graphical visualizations of distributions to aid understanding
- Broad distribution coverage with quick computations and links to formulas for mean/variance; supports raw-data input for hypothesis testing and confidence intervals
- Valued by students and educators as a budget-friendly, practical learning tool

### Cons

- Exam usage restrictions: some professors do not allow using the app during exams

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Source: [Chrome-Stats](https://chrome-stats.com/d/id889106396)