Решение задачи N1055 теория вероятностей Лапласа

1055. 400 machines work independently of each other, and the probability of uninterrupted operation of each of them during the shift is 0.9. Find the probability that during the shift they will work without fail: a) 370 machines; b) from 350 to 370 machines.

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