The modern level of development of computer technologies allows the study of probability theory and mathematical statistics to be brought to a new educational level, focusing on the applied part of the discipline - mathematical statistics and computer data analysis. The tutorial describes the elements of combinatorics, various ways to calculate probabilities, the concepts of a random variable, its functional and numerical characteristics are given. Theoretical material is accompanied by examples and specially selected tasks that allow you to study the material in depth. A separate chapter describes how to use Excel and STATISTICA to solve application problems. Excel is part of Microsoft Office and is one of the most popular applications in the world today. STATISTICA occupies a leading position among data analysis programs, has more than a million users worldwide. The program is fully Russified, an intelligent knowledge portal has been created, which represents a global multimedia resource for a wide range of users: schoolchildren, students, graduate students - everyone who wants to develop their intelligence, get acquainted with modern technologies of computer data analysis.