The class marks of a distribution are 105, 115, 125, 135, 145, 155, 165. The class size is :

Options

A. 5
B. 10
C. 15
D. 20

Answer

To find the class size from the given class marks, we will follow these steps:

### Step 1: Identify the class marks
The class marks given are: 105, 115, 125, 135, 145, 155, 165.

### Step 2: Calculate the difference between consecutive class marks
To find the class size, we need to calculate the difference between any two consecutive class marks. We can take the first two class marks for this calculation.

- The first class mark is 105.
- The second class mark is 115.

### Step 3: Subtract the first class mark from the second class mark
Now, we will perform the subtraction:

\[ \text{Class Size} = \text{Second Class Mark} - \text{First Class Mark} \]

\[ \text{Class Size} = 115 - 105 \]

### Step 4: Calculate the result
Now, we will calculate the result of the subtraction:

\[ \text{Class Size} = 10 \]

### Final Answer
The class size is 10.

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