Question

Write the class marks of the interval 120 – 140​

Answer 1

Method 1:

x = (140-120) / 2

x = 20 / 2

x = 10

Now add x to 120 to get your class mark

So, class mark = 120 + 10

= 130

Method 2:

class mark = (120+140) / 2

= 260 / 2

= 130

Use the method which you find easy.

HOPE THIS HELPS !!!

Answer 2

The class mark of the class interval 120 – 140 is 130

Given :

The class interval 120 – 140

To find :

The class mark of the class interval 120 – 140

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 120 – 140

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class interval 120 – 140

Upper Class boundary = 140

Lower class boundary = 120

Step 3 of 3 :

Find class mark of the class interval

The class mark of the class interval

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

$\displaystyle \sf{ = \frac{140 + 120}{2} }$

$\displaystyle \sf{ = \frac{260}{2} }$

$\displaystyle \sf{ = 130}$

━━━━━━━━━━━━━━━━

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

#SPJ3