Question

The class-mark of the class 35-45 is ______.

Options

• 35

• 45

• 40

• 42

Answer 1

The class-mark of the class 35-45 is 40.

Explanation:

The class mark represents the exact midpoint of a given class interval and is calculated by averaging its lower and upper limits. For the class interval 35-45, the calculation is:

`\frac{35 + 45}{2} = 40`