Решение задачи N1854 теория вероятностей Лапласа

1854. The device consists of 400 elements, working independently of each other. The probability of failure of any element that has worked time t is 0.15. Find the most probable number of devices that can refuse after a time t and the probability of rejecting such an amount.

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