Question

mean of 50 observations was found to be 80.4 but later on it was discovered that 96 was misread as 69 at one place.find the correct mean

Answer 1

MEAN OF 50 OBSERVATIONS=80.4

96 IS MISTAKEN AS 69

ACTUAL MEAN=((80.4*50)+96-69)/50
                             
                             =4020+27/50
    
                             =4047/50
                               
                             =80.94
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