Mean =( Sum of all observations )÷( Number of observations ) Calculations: Initial sum of observations = Mean × Number of observations =50×100=5000 Difference in sum due to misread observations =(182+56)−(82+6)=238−88=150 Corrected sum of observations =5000+150=5150 Corrected mean = Corrected sum ÷ Number of observations =5150÷100=51.5
