This textbook is intended to prepare students of economic universities for passing exams. The publication contains a complete course of lectures on the theory of statistics, compiled by professional economists. Students are encouraged to familiarize themselves with the theory of statistics. Methods of statistical observation, summary, grouping of data, average values, indicators of variation, correlation and regression analyses, time series analysis, indices, the use of graphical methods and much more are considered. The publication is intended for students studying in the specialty “Statistics” and other economic specialties.