Question

The formula for finding mean by direct method is `(sum(AxxB))/(sumA)` where B and A are respectively.

पर्याय

• Class mark, frequency of the class

• Average frequency, class size

• Class size, average frequency

• Frequency of the class, class mark

Answer 1

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.