The body weight of seven boys is recorded as 67 kg, 45 kg, 87 kg. 65 kg. 86 kg, 54 kg and 58 kg. What is the average body weight of all seven boys ?

Options

A. 68 kg
B. 66 kg
C. 64 kg
D. 62 kg

Answer

To find the average body weight of the seven boys, follow these steps:

### Step 1: List the weights
The body weights of the seven boys are:
- 67 kg
- 45 kg
- 87 kg
- 65 kg
- 86 kg
- 54 kg
- 58 kg

### Step 2: Calculate the total weight
Add all the weights together:
\[ 67 + 45 + 87 + 65 + 86 + 54 + 58 \]

Calculating step-by-step:
- \(67 + 45 = 112\)
- \(112 + 87 = 199\)
- \(199 + 65 = 264\)
- \(264 + 86 = 350\)
- \(350 + 54 = 404\)
- \(404 + 58 = 462\)

So, the total weight is \(462\) kg.

### Step 3: Count the number of boys
The number of boys is \(7\).

### Step 4: Calculate the average weight
To find the average, divide the total weight by the number of boys:
\[ \text{Average} = \frac{\text{Total Weight}}{\text{Number of Boys}} = \frac{462}{7} \]

Calculating the division:
\[ 462 \div 7 = 66 \]

### Conclusion
The average body weight of all seven boys is \(66\) kg.

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