Решение задачи N1915 теория вероятностей Лапласа

1915. When checking the quality of products, 10% of products are usually rejected. 625 pieces were selected. What is the probability that among the selected: a) at least 550 and not more than 575 standard products; b) at least 540 and not more than 580 standard?

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