The mean of 20 observations is 12.5. By error, one observation was noted as -15 instead of 15. Then the correct mean is ....
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answer is 27.5
becoz if it -15 it is 12.5
then if it is 15 add it to 12.5
becoz if it -15 it is 12.5
then if it is 15 add it to 12.5
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