1.

Find the class marks of classes 10 - 25 and 35 - 55

Answer»

We know, 

class marks of a class interval is

\(=\frac{1}{2}(lower\,limit+upper\,limit)\)

For 10 - 25 

Lower limit = 10 

Upper limit = 25

Class mark = \(\frac{1}{2}(10+25)=17.5\)

For 35 - 55 

Lower limit = 35 

Upper limit = 55

Class mark = \(\frac{1}{2}(35+55)=45\)


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