Question

The class marks of a frequency distribution are 5,10,15,20.... What is the corresponding to class mark 20 ? Complete process.​

Answer 1

Step-by-step explanation:

Given, CM= 15,20,25,30,35.....

Since the CM are of equal width, then class size= 20-15=5

Using the formula:

a+(h/2) and a-(h/2), Where a= CM and h=class size

Substituting,

20+(5/2)=20+2.5=22.5

20-(5/2)=20-2.5=17.5

Therefore, class (CM=20) is 22.5-17.5

Again, 

25+(5/2)=25+2.5=27.5

and 25-(5/2)=25-2.5=22.5

Therefore, Class= 22.5-27.5

Answer 2

Step-by-step explanation:

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