Решение задачи N1892 теория вероятностей Лапласа

1892. The packer packs 400 parts, checked by OTC or manufactured by workers with a personal stamp. The probability that the part is marked with a personal stamp is 0.25. What is the probability that the parts marked with a personal stamp will be: a) 100 pieces; b) from 100 to 115 pieces?

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