Question

class mark of class interval 20-30

Answer 1

Class mark is the mid - value of a class interval. That is:

Upper Limit + Lower Limit/2

Upper Limit: 30

Lower Limit: 20

Here class mark of interval 20 - 30 is:

30 + 20/2

= 50/2

= 25

Hope it helps :)

Answer 2

The class mark of the class interval 20 - 30 is 25

Given :

The class interval 20 - 30

To find :

The class mark of the class interval

Concept :

Class Mark :

For any grouped frequency table with class intervals, the middle value of the class limits or the class boundaries of any class is called class mark of the class

Solution :

Step 1 of 3 :

Write down the given class interval

The given class interval is 20 - 30

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class interval 20 - 30

Upper Class boundary = 30

Lower class boundary = 20

Step 3 of 3 :

Find class mark of the class interval

The class mark of the class interval

$\displaystyle \sf{ = \frac{Upper \: Class \: boundary + Lower \: class \: boundary }{2} }$

$\displaystyle \sf{ = \frac{30 + 20}{2} }$

$\displaystyle \sf{ = \frac{50}{2} }$

$\displaystyle \sf{ = 25}$

━━━━━━━━━━━━━━━━

Learn more from Brainly :-

$1.$ The class mark of the class 90-130 is: a. 90 b. 105 c. 115 d. 110

https://brainly.in/question/47613006

2. For a frequency distribution, the mid-value of the class is 65 and the class size is 8 . What is the upper limit of the ...

https://brainly.in/question/26841285