Решение задачи N1801 теория вероятностей Лапласа

1801. According to statistics in the city of N, on average 15% of the opening new enterprises cease operations within a year. Calculate the likelihood that of the 100 newly opened enterprises in the city of N, by the end of the year they will cease their activities: a) 12; b) not more than 18; c) not less than 10, but not more than 20 enterprises.

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