Решение задачи N1889 теория вероятностей Лапласа

1889. The packer packs 900 parts, checked by OTC or manufactured by workers with a personal stamp. The probability that the part is marked with a personal stamp is 0.1. Determine the probability that among them will be with a personal brand: a) 115 parts; b) from 100 to 120 parts.

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