Question

find the class mark of class 31 to 40

Answer 1

Answer:

Step-by-step explanation:

Class mark is of a class is a-b is given by (a+b)÷2

Hence 31-40

(31+40)÷2 =71÷2

Answer 2

Answer:

Class Mark of 31 - 40 is 35.5

Step-by-step explanation:

Given Class Interval is 31 - 40

To find: Class mark of the given Class interval

Class mark is defined as the Average of the class limit of a interval.

Class Mark is also known as Mid point of Class interval.

$Class\:Mark=\frac{upper\:limit+lower\;limit}{2}$

Thus, Class mark of 31 - 40

Upper limit = 40 & Lower limit = 31

Thus, Class Marks = $\frac{40+31}{2}=\frac{71}{2}=35.5$

Therefore, Class Mark of 31 - 40 is 35.5