Решение задачи N810 теория вероятностей Лапласа

810. To the main water pipeline are connected 100 enterprises, each of which with a probability of 0.8 at the given moment of time draws water. Find the likelihood that at the moment the water intake is produced: a) no less than 75 and no more than 90 enterprises; b) no more than 90 enterprises.

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