Решение задачи N4626 теория вероятностей Пуассона

4626. Radio equipment consists of 1000 elements. The probability of failure of one element during the year of operation is 0.001 and does not depend on the state of other elements. What is the probability of failure of at least three and exactly three elements in a year?

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)