Question

3)
5)
(15) Find out the class mark of 10 - 25 and 35 - 55 class
Chp.16)​

Answer 1

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,

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

Now ,

i) Class interval (10-25)

lower limit = 10 ,

upper limit = 25

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

classmarkof10−25=

2

10+25

=

2

35

=17.5

ii ) class interval (35-55)

lower limit = 35 ,

,upper limit = 55

classmark of 35−55= 2

35+55

=

90

=45

Therefore,

class mark of (10-25) = 17.5

and

class mark of (35-55)=45