Решение задачи N219 теория вероятностей Лапласа

219. There are 100 machines of the same capacity working independently of each other in the same mode, at which their drive with a probability of 0.8 turns on during the entire working time. What is the probability that at an arbitrarily taken time will turn on from 70 to 86 machines?

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