Решение задачи N4744 теория вероятностей

4744. For the performance of the control work, 24 students received the following marks: 8 students - "excellent", 6 - "good", 6 - "satisfactory", 4 - "unsatisfactory". Find the probability that the work of a randomly selected student is rated positively.

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