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Question

The formula for finding mean by direct method is
(A×B)A

where B and A are respectively are _______.


A
frequency of the class, class mark
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B
class size, average frequency
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C
average frequency, class size
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D
class mark, frequency of the class
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Solution

The correct option is D class mark, frequency of the class

Given, Mean = (A×B)A........(i)

Mean (¯¯¯x)=fxf ..........(ii)

where, 'f' is the frequency of a class
'x' is the class mark of the class

Now, comparing (i) and (ii), we get,

'A' is the frequency of the class
and 'B' is the class mark.


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