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The mean of 20 observations is $15 .$ On checking, it was found that two observations were wrongly copied as 3 and 7 wrong observations are replaced by correct value 8 and 4, then the correct mean is
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$15.15$
Sum of all observations $=20 \times 15=300$ Sum of correct observations $=300-(3+6)+(8+4)=303$
Correct mean $=\frac{303}{20}=15.1$ ?
Correct mean $=\frac{303}{20}=15.1$ ?
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