Question

write formula to find to the class-mark of a class interval .

Answer 1

here is your answer.

The formula to find the class mark of a class interval is given below.

$class \: mark \: = \: upper \: limit + lower \: limit \: \div 2$

Answer 2

Answer:

$class \:mark (x)\\=\frac{lower\:limit + upper \: limit }{2}$

Explanation:

$\boxed {class \:mark (x)\\=\frac{lower\:limit + upper \: limit }{2}}$

Example:

Let class interval 30-40

lower limit = 30

upper limit = 40

$class \:mark (x)\\=\frac{30+ 40}{2}$

$\implies x =\frac{70}{2}$

$\implies x = 35$

Therefore,

Class mark of class interval (30-40) = 35

•••••