Question

find the class mark of :150-170​

Answer 1

Answer:

class mark = ( 150 +170 )÷2

320÷2,

=160

160is your answer

Answer 2

The class mark of the class interval 150 - 170 is 160

Given :

The class interval 150 - 170

To find :

The class mark of the class interval

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 interval is 150 - 170

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class interval 150 - 170

Upper Class boundary = 170

Lower class boundary = 150

Step 3 of 3 :

Find class mark of the class interval

The class mark of the class interval

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

$\displaystyle \sf{ = \frac{170 + 150}{2} }$

$\displaystyle \sf{ = \frac{320}{2} }$

$\displaystyle \sf{ = 160}$

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