Question

assume mean method formula proving

Answer 1

Heya user,
Here is your answer to the question.

Assumed mean formula :
a+Sumation of fidi /Sumation of fi.
where a=assumed mean.

Hope it helps.

Answer 2

formula for mean = sum of the observation / number of observation
  example
      let find the mean of first 5 natural numbers
      1,2,3,4,5 is first 5 natural numbers
    mean = 1+2+3+4+5 / 5  = 15 / 5  = 3