Решение задачи N1895 теория вероятностей Пуассона

1895. The packer stacks 900 parts, checked by OTC or manufactured by workers who have a personal stamp. The probability that the part is marked with a personal stamp is 0.005. What is the probability that the details marked with a personal stamp will be: a) at least two; b) 2; c) not less than 2?

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