Решение задачи N1080 теория вероятностей Лапласа

1080. The power plant serves a network with 6000 light bulbs, the probability of including each of them during the time t is equal to 0.8. Find the probability that at the same time the following will be turned on: a) exactly 4750 bulbs; b) not less than 4750 bulbs.

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