While note down of marks scored in an examination by the students of a class, by mistake the marks scored by one student got recorded as 96 in place of 69 and thereby the average marks increase by 0.3. What was the number of students in the class?

85 76 90 92

90

Difference = 96 - 69 = 27                      .3 unit = 27                      1 unit = 90  Total students  = 90