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Q.

Class-mark is defined as the average of


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a

different frequency distribution

b

upper and lower limits of class

c

highest and lowest value of data

d

different mid values 

answer is B.

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Detailed Solution

It is given class mark.
The least value of data that is included in a group or class is its lower limit.
The maximum value of data that can be found in a group or class is its upper limit. A class mark is the midpoint of the categories in the class's frequency distribution table. It is the center of the bar in a histogram.
Class mark class mark is defined as the average of the upper and lower limits of a class. Class mark =  Upper limit + Lower limit 2
Therefore, the correct option is 2.
 
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Class-mark is defined as the average of