Question

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

Answer 1

class mark of class 10-25:-
(10+25)/2
=35/2
=17.5
class mark of class 35-55:-
(35+55)/2
=90/2
=45

Answer 2

Answer:

class mark of (10-25) = 17.5

and

class mark of (35-55)=45

Step-by-step explanation:

Given class intervals 10-25,

35 -55

\* We know that,

$\boxed {class\:mark \:(x)\\=\frac{lower\:limit+upper\:limit}{2}}$ *\

Now ,

i) Class interval (10-25)

lower limit = 10 ,

upper limit = 25

$class\: mark\: of 10-25 = \frac{10+25}{2}\\=\frac{35}{2}\\=17.5$

ii ) class interval (35-55)

lower limit = 35 ,

,upper limit = 55

$class\: mark \:of 35-55 = \frac{35+55}{2}\\=\frac{90}{2}\\=45$

Therefore,

class mark of (10-25) = 17.5

and

class mark of (35-55)=45

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