The marks obtained by a student in examinations are given below :
80, 72, 84, 79, 90
find the average marks of the student

Answer

To find the average marks obtained by the student, we will follow these steps:

### Step 1: List the marks
The marks obtained by the student are:
- 80
- 72
- 84
- 79
- 90

### Step 2: Calculate the sum of the marks
We need to add all the marks together:
- \( 80 + 72 + 84 + 79 + 90 \)

Let's perform the addition step by step:
1. \( 80 + 72 = 152 \)
2. \( 152 + 84 = 236 \)
3. \( 236 + 79 = 315 \)
4. \( 315 + 90 = 405 \)

So, the total sum of the marks is **405**.

### Step 3: Count the number of subjects
Next, we count how many marks (subjects) there are:
- There are 5 marks.

### Step 4: Calculate the average
Now, we use the formula for average:
\[ \text{Average} = \frac{\text{Sum of all marks}}{\text{Total number of subjects}} \]
Substituting the values we found:
\[ \text{Average} = \frac{405}{5} \]

Now, we perform the division:
- \( 405 \div 5 = 81 \)

### Final Answer
The average marks of the student is **81**.

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