Instructions: In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Input: Problem: the average marks of 30 students in a class is 60 . but a student mark is wrongly noted as 90 instead of 15 then find the correct average marks ?
Options: a ) 55.65 , b ) 57.5 , c ) 62.5 , d ) 45.25 , e ) 50
Output:
b