Решение задачи N4130 теория вероятностей Лапласа

4130. The power plant of the state farm gives a current of 2100 electric bulbs. The probability of switching on for each lamp in the evening is 0.7. Find the probability that, at random, taken the evening the number of lamps included will range from 1450 to 1500.

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