Question

Find the class mark of class 90-130.​

Answer 1

Answer:

class mark = ( upper limit + lower limit) / 2

= ( 90 + 130)/2

= 220/2

110

Answer 2

SOLUTION

TO DETERMINE

The class mark of the class interval 90 - 130

CONCEPT TO BE IMPLEMENTED

CLASS INTERVAL

When the number of sample values are large in number and are in wide range, then the whole data is divided in a number of several groups according to the size of the sample. Each of these groups, made as above, is known as class interval

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

EVALUATION

Here the given class interval is 90 - 130

Upper class limit = 130

Lower class limit = 90

So the required class mark of the class interval 90 - 130

$\displaystyle \sf{ = \frac{90 + 130}{2} }$

$\displaystyle \sf{ = \frac{220}{2} }$

= 110

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