Question

The class mark of the class, 90 - 130 is *​

Answer 1

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 Length :

Length of the class interval of an class is defined to be the difference between the lower and upper class boundaries ( not class limits) of that particular class interval.

Class length = Upper Class boundary - Lower class boundary

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 boundary = 130

Lower class boundary = 90

So the required class mark of the class interval

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

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

= 110

FINAL ANSWER

The class mark of the class, 90 - 130 is 110

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