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Probability distributions are theoretical distributions based on assumptions about a source population. The distributions ssign probability to the event that a random variable has a specific, discrete value, or falls within a specified range of continuous values. Statistics and Machine Learning Toolbox offers several ways to work with probability distributions.* Use "Probability Distribution Objects" to fit a probability distribution object to sample data, or to create a probability distribution object with specified parameter values.* Use "Probability Distribution Functions" to work with data input from matrices.* Use "Probability Distribution Apps and User Interfaces" on to interactively fit, explore, and generate random numbers from probability distributions. Available apps and user interfaces include:* The Distribution Fitter app* The Probability Distribution Function user interface* The Random Number Generation user interface (randtool)