The marks of six boys in a group are 48, 59, 87, 37, 78 and 57. What are the average marks of all six boys?

Options

A. 62
B. 64
C. 61
D. 63

Answer

To find the average marks of the six boys, we will follow these steps:

### Step 1: Write down the marks
The marks of the six boys are:
- Boy 1: 48
- Boy 2: 59
- Boy 3: 87
- Boy 4: 37
- Boy 5: 78
- Boy 6: 57

### Step 2: Calculate the sum of the marks
Now, we will add all the marks together:
\[ 48 + 59 + 87 + 37 + 78 + 57 \]

Calculating step-by-step:
- First, add 48 and 59:
\[ 48 + 59 = 107 \]
- Next, add the result to 87:
\[ 107 + 87 = 194 \]
- Then, add 37:
\[ 194 + 37 = 231 \]
- Now, add 78:
\[ 231 + 78 = 309 \]
- Finally, add 57:
\[ 309 + 57 = 366 \]

So, the total sum of the marks is \( 366 \).

### Step 3: Divide the sum by the number of boys
To find the average, we divide the total sum by the number of boys (which is 6):
\[ \text{Average} = \frac{\text{Total Sum}}{\text{Number of Boys}} = \frac{366}{6} \]

Calculating:
\[ \frac{366}{6} = 61 \]

### Step 4: State the average marks
Thus, the average marks of all six boys is \( 61 \).

### Final Answer:
The average marks of all six boys is **61**.

---