Find the mode of the marks

To find the mode of the marks, we first need to list the results and count the frequency of each score.

Here are the marks from the provided data:

- 17, 18, 17, 14, 8, 3, 15, 18, 3, 15
- 0, 17, 16, 17, 14, 7, 18, 19, 5, 15

Now, let's count how many times each score appears:

- 0: 1
- 3: 3
- 5: 1
- 7: 1
- 8: 1
- 14: 2
- 15: 4
- 16: 1
- 17: 4
- 18: 3
- 19: 1

Now we can summarize the frequencies:

- 0: 1
- 3: 3
- 5: 1
- 7: 1
- 8: 1
- 14: 2
- 15: **4**
- 16: 1
- 17: **4**
- 18: 3
- 19: 1

The mode is the number that appears most frequently. Both 15 and 17 appear 4 times, which means they are both modes.

Therefore, the answer to the question is:
- The modes are **15** and **17**.

However, if you must select only one from the options provided, you could choose either 15 or 17.