The following table shows the number of marks secured by the students of a class in a `50` marks exam.
`{:("Score",,"Number of students"),("Less than or equal to 10 marks ",,2),("More than 10 marks and less then or equal to 20 marks" ,,5),("More than 20 marks and less then or equal to 30 marks",,9),("More than 30 marks and less then or equal to 40 marks",,14),("More than 40 marks and less then or equal to 50 marks",,10):}`
How many students secured less then or equal to `30` marks in that exam ?

Options

A. 9
B. 14
C. 23
D. 16

Explanation

To find out how many students secured less than or equal to 30 marks in the exam, we can analyze the data provided in the table.

### Step-by-Step Solution:

1. **Identify the ranges of scores and the number of students for each range:**
- Less than or equal to 10 marks: 2 students
- More than 10 marks and less than or equal to 20 marks: 5 students
- More than 20 marks and less than or equal to 30 marks: 9 students
- More than 30 marks and less than or equal to 40 marks: 14 students
- More than 40 marks and less than or equal to 50 marks: 10 students

2. **Add the number of students who scored less than or equal to 30 marks:**
- Students who scored less than or equal to 10 marks: 2
- Students who scored more than 10 marks and less than or equal to 20 marks: 5
- Students who scored more than 20 marks and less than or equal to 30 marks: 9

Now, we will sum these numbers:
\[ \text{Total students} = 2 + 5 + 9 \]

3. **Calculate the total:**
\[ \text{Total students} = 2 + 5 + 9 = 16 \]

4. **Conclusion:**
Therefore, the total number of students who secured less than or equal to 30 marks is **16 students**.