Question

what is the formula of mean in assume method and explain the terms in it?​

Answer 1

Answer:

$mean = A + \frac{\sum f_i d_i}{\sum f_i}$

where, A is the assumed mean taken from frequency table

           $f_i$ is the frequency of the class interval taken

   and $d_i$ = $x_i - A$  , where $x_i$ is the middle element of the class interval

example of the usage of formula with class interval , frequency table is attached here.

Answer 2

Answer:

x= a+Sigma fidi/sigma fi

Step-by-step explanation:

here, a= assumed mean

fi= frequency of ith class

di= xi-a (deviation of ith class)

sigma fi= total number of observations (n)

xi= class mark (upper limit- lower limit/2)