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 Solution The mean of 10 observations is 12.5 . While calculating the mean one observation was by mistake taken as -8 instead of +8 . Find the correct mean.Solution:Your problem -> The mean of 10 observations is 12.5 . While calculating the mean one observation was by mistake taken as -8 instead of +8 . Find the correct mean.Here Mean X = 12.5 and n = 10Sigma(X) =  X  × n = 12.5 × 10 = 125:. the correct sum Sigma(X) = 125 - (Wrong Observation) + (Correct Observation) = 125 - ( -8 ) + ( 8 ) = 141.:. "correct mean" = "correct sum" / n = 141 / 10 = 14.1. Solution provided by AtoZmath.com Any wrong solution, solution improvement, feedback then Submit Here Want to know about AtoZmath.com and me