Question

find the class mark of the class 35_45​

Answer 1

$class \: mark = \frac{35 + 45}{2} \\ \frac{80}{2} \\ = 40$

Answer 2

class mark is equals to sum of two numbers divided by 2

therefore, 35+45/2

80/2

40

show the class mark of the class 35 to 45 is 40.