Question

In History project, marks out of 20 were awarded to 8 students. The marks were as shown below: 14, 16, 18, 14, 16, 14, 12, 16
Each of the above students was 2 extra marks for submitting the project a week before the due date. What is the revised mean of this group?

Answer 1

When extra 2 marks are awarded, new addition to total marks scored 
= 2 x 8
= 6
∴ New total marks scored
= 120 + 16
= 136
∴ Revised mean marks

= `(136)/(8)`
= 17.