Mean of 25 observations was found lo be 78.4. but later it was found that 96 was mis~read as 69. then the corrected mean is
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Incorrect Σxi= 25*78.4 = 1960 correct Σxi = Incorrect Σxi- incorrect value + correct value = 1960-69+96 => 1987 correct mean = correct Σxi/n = 1987/25 = 79.48 ans................
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