The marks of 20 students in an examination are given in the following table. Average marks of these student is:

The average marks of 42 students in an examination, was 64. Later it was found that the marks of three students were misread as 72, 58 and 44 instead of the actual marks 64, 42 and 26 respectively. What is the correct average marks?

The average marks obtained by 120 students in an examination is 30. If the average marks of passed students is 40 and that of the failed students is 10, what is the 25% of the number of students who passed the examination?

The average marks obtained by 150 students in an examination is 40. If the average marks of passed students is 60 and that of the failed students is 20, then what is the number of students who passed the examination?

The marks obtained by a student in examinations are given below : 80, 72, 84, 79, 90 find the average marks of the student

The marks obtained by 41 students in an examination in Math are given below: Find the average of the marks obtained by them.

The marks (maximum marks 100) obtained by 20 students in a test are given below : Find the mean marks of the 20 students.

The marks obtained by 30 students in a examination of a class are given below . Find their average.