The mean of 50 observations was 40. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is
Answers.
A) 40.46 B) 36.1 C) 36.5 D) 39.1 E) None
Sol.   Therefore correct sum   = ( 40 × 50 + 48 – 23)   = 2023.   Therefore correct mean   = 2023 / 50   = 40.46.   40.46nswer 40.46
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The mean of 50 observations was 40. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is