Question

Class mark of the class 100-120 is?
(a) 100 (b) 140 (c) 115 (6) 120​

Answer 1

Answer:

Options are wrong, answer is 110

Step-by-step explanation:

100+120/2=220/2=110

Answer 2

The class mark of the class 100 - 120 is 110

Given :

The class 100 - 120

To find :

The class mark of the class is

(a) 100

(b) 110

(c) 115

(d) 120

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

The given class is 100 - 120

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class 100 - 120

Upper Class boundary = 120

Lower class boundary = 100

Step 3 of 3 :

Find class mark of the class

The class mark of the class

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

$\displaystyle \sf{ = \frac{120 + 100}{2} }$

$\displaystyle \sf{ = \frac{220}{2} }$

$\displaystyle \sf{ = 110}$

Hence the correct option is (b) 110

Correct question : The class mark of the class 100-120 is a) 100 b) 110 c) 115 d) 120

━━━━━━━━━━━━━━━━

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