Final answer:
To determine the percentage of tennis matches where Olga served more than 6 aces, we need the specific number of such matches and the total number of matches she played. This allows us to calculate the desired percentage. Without this data, we cannot provide an accurate answer to the question.
Step-by-step explanation:
The question is asking for a percentage, therefore the subject of the question is Mathematics, and the grade level would typically be High School, as this involves understanding of statistical concepts such as percentages, which are taught at this level.
To determine what percent of tennis matches Olga served more than 6 aces, we would need additional data such as the number of matches in which she served more than 6 aces compared to the total number of matches played. If we had that data, we would use the formula:
Percentage = (Number of matches with more than 6 aces / Total number of matches) × 100
However, without such data, we cannot determine the exact percentage. The available options (a. 10%, b. 20%, c. 30%, d. 40%) would need to be selected based on statistical data not provided in the question.