Question

Whaf is the formula of mean

Answer 1

$\bold{Hey \ Dude}$

Here Is your answer

The formula of mean is, Mean <x> = ∑x/N 

where 

∑ represents the summation

x represents scores

N represents number of scores.

Hope Its help you

Answer 2

mean= sum of all observation/total no. of observation

$= a + \frac{fidi}{fi}$

$= a + h( \frac{fiui}{fi} )$

sorry but i dont know how to write sigma