Question

Write the formula to find Mean' of a grouped data in direct method and
explain its terms ?​

Answer 1

£fixi/£fi

hope it helps

Answer 2

mean= A+fidi ×n/fi

A assumed mean

fi is the frequency of the given data

N is total no of frequency

di = Xi - A

Xi=sum of class divided by 2

observation table

class | fi | Xi | di | fidi |