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Question
The formula for finding mean by direct method is `(sum(AxxB))/(sumA)` where B and A are respectively.
Options
Class mark, frequency of the class
Average frequency, class size
Class size, average frequency
Frequency of the class, class mark
MCQ
Solution
Class mark, frequency of the class
Explanation:-
`barx=(sumfx)/(sumf)=(sum(AxxB)/(sumA))`
Where B is the class mark.
Class mark = `1/2` (upper limit of class + lower limit of class) and A is the frequency of the class.
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