Решение задачи N1036 теория вероятностей Лапласа

1036. 100 machines work independently of each other, and the probability of uninterrupted operation of each of them during the shift is 0.8. Find the probability that during the shift, they will work without fail: a) 85 machines; b) from 75 to 85 machines.

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