Mathaid interactive Probability and Statistics tutorial is a new java-based package for e-learning and Casa schooling. It guides the user through all steps of the learning process, from theoretical concepts, examples, problem-solving lessons, drills to customized tests including solutions and evaluation. The emphasis is on interactivity and "living" formulas - the unique Gráficos and animations bring life to the formulas and make learning and exploring maths real fun. Topics covered: counting principles and probability, random variables, discrete distributions, continuous distributions, distributions related to the normal, parameter estimation, hypothesis testing, linear regression. The demo Versión contains selected lessons from the full Versión, fully functional, all features included.