The marks scored by 10 students are given below.

12, 12, 20, 12, 12, 17, 17, 18, 18, 13

The mode of the data is:

The correct option is 12.

Step-by-step Explanation:

1. Understand the concept of Mode:
The mode of a set of data values is the value that appears most frequently in the dataset.

2. List the given data:
The marks scored by the 10 students are:
12, 12, 20, 12, 12, 17, 17, 18, 18, 13

3. Count the frequency of each value:
Let's count how many times each number appears in the list:
- The number 12 appears 4 times.
- The number 13 appears 1 time.
- The number 17 appears 2 times.
- The number 18 appears 2 times.
- The number 20 appears 1 time.

4. Identify the mode:
Since the value 12 has the highest frequency (it appears 4 times, which is more than any other number), the mode of the given data is 12.