The mean of 100 observations was calculated as 40. It was found later on that one of the observ

$Sum \: of \: 100\: observations = 100*40=4000$
$53 \: misread \: as \: 83$
$So \: 30 \: more$
$New \: sum = 4000-30 = 3970$
$Avg. = \frac{3970 }{100}= 39.7$

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