mean of 12 observations was found to be 28. later on it was detected that an observation 62was misreadas26 then the correct mean of observation will be
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mean = sum of all/ no. of all
28= sum of all/12
28×12= sum of all
336=sum of all
mean =336-26+62/12
mean=336+36/12
mean=372/12
mean=31
28= sum of all/12
28×12= sum of all
336=sum of all
mean =336-26+62/12
mean=336+36/12
mean=372/12
mean=31
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