X = A + (Σd/N) is the formula for calculating _________________.

The correct answer is option 1: Arithmetic Mean

$\overline{X}$ = A + (Σd/N) is the formula for calculating Arithmetic Mean by using assumed mean method.

Sum of all deviations is taken as Σd=Σ (X-A)

A = assumed mean

X = individual observations

N = total numbers of observations

d = deviation of assumed mean from individual observation, i.e. d = X – A