Class mark of class interval 60–70 is

Options

A. 60
B. 70
C. 65
D. 72

Answer

To find the class mark of the class interval 60–70, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Class Interval**:
The class interval given is 60–70. Here, 60 is the lower limit and 70 is the upper limit.

2. **Use the Class Mark Formula**:
The formula to calculate the class mark (also known as the midpoint) is:
\[ \text{Class Mark} = \frac{\text{Lower Limit} + \text{Upper Limit}}{2} \]

3. **Substitute the Values**:
Substitute the lower limit (60) and the upper limit (70) into the formula:
\[ \text{Class Mark} = \frac{60 + 70}{2} \]

4. **Calculate the Sum**:
First, calculate the sum of the lower and upper limits:
\[ 60 + 70 = 130 \]

5. **Divide by 2**:
Now, divide the sum by 2 to find the class mark:
\[ \text{Class Mark} = \frac{130}{2} = 65 \]

6. **Conclusion**:
Therefore, the class mark of the class interval 60–70 is **65**.

### Final Answer:
The class mark of the class interval 60–70 is **65**.

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