Решение задачи N807 теория вероятностей Лапласа

807. 160 enterprises are connected to the main water pipeline, each of which with a probability of 0.7 at the moment is taking water. Find the probability that at the moment the water intake is carried out
1) exactly 100 enterprises;
2) no less than 80 and no more than 120 enterprises.

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