The mean of 40 observations was 160. It was detected on rechecking that the value of 165 was wrongly copied as 125 for computation of mean. Find the correct mean.

Explanation

Mean of 40 observations`=160`
Number of terms `(n)=40`
Mean`=(sumx_i)/n`
160`=(sumx_i)/40`
`sumx_i=160xx40`
`sumx_i=6400`
Now, the correct mean will be:
Mean`=(6400-125+165)/40`
Mean`=6440/40`
Mean`=161`
Hence, the correct mean is `161`.