Task: Question Answering
Input (English): Problem: the mean of 30 values was 140 . it was detected on rechecking that one value 145 was wrongly copied as 135 for the computation of the mean . find the correct mean . 
Options: a ) 151 , b ) 140.33 , c ) 152 , d ) 148 , e ) none of the above
Output (English): b