This book introduces the reader to the basics of mathematical statistics. Its author, the famous scientist van der Varden, managed, without compromising mathematical rigor, to structure his presentation in such a way that reading the book does not require acquaintance with any special sections of mathematics. Numerous examples illustrating the application of mathematical statistics to various scientific and practical problems are of considerable interest. The book will be of great benefit to both applied specialists using mathematical statistics methods in their work, as well as researchers, graduate students and students specializing in this field ..