In a grouped frequency distribution, the value of each observation of a particular class is assumed to be an average of upper and lower boundaries of that class. This value is called________.

Class length

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Distributed average

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Class mark

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Average length

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Solution

The correct option is C Class mark
In a grouped frequency distribution table, individual values of all the observations can't be identified but the value of each observation of a particular class is assumed to be average of upper and lower boundaries of that class. This value is called 'class mark' or 'mid-value'.

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