ABSTRACT
The loading and unloading of a ship have a random duration depending on a number of factors such as loading facilities, quantity and character of the cargo, and its packing. In this chapter, the authors deal with random phenomena not from time to time but regularly because they often play an essential role in the structure of an investigated real process. They perform a sequence of trials in each of which some specified event A may or may not occur. The authors express only their subjective judgement based on their knowledge of this student. The task of probability theory is to investigate objective regular properties of a phenomenon which do not depend on subjective viewpoints of one or another researcher. The authors describe two types of trial repetitions, in practice: the same physical object is a subject of consecutive trials under some fixed conditions; and different identical physical objects are tested at the same conditions.
