Those of you who have studied statistics know about various statistical distributions. They all have their own formulas and special characteristics. Thanks to Probabilities of Statistical Distributions for iPhone, you can compute 17 distributions. It has line and bar charts for distributions and covers the basic formulas.
This app covers exponential, normal, uniform, Chi-Square, gamma, beta, binomial, geometric, and other distributions. It lets you type math expressions without a whole lot of hassle.[where to get it]