Here a = 125, h = 50, ∑fiui = 43
Now
\(\overline{x}= a+(\frac{\Sigma f_iu_i}{\Sigma f_i})\times h\)
= 125 + × 50
= 125 + (43 × 2)
= 125 + 86
= 211.
NOTE: If we consider first value as “a” then we dont get negative values in ui , fiui columns. Then it becomes easy for calculation.