Question

A class had 9 students. In one test,
the class average was 61. One student's
paper was scored incorrectly, and the
resulting score was raised 18 points. What is
the corrected class average?​

Answer 1

Answer:

average is 63

Step-by-step explanation:

x/9=61

if 18 points are added,

x+18/9=x/9+18/9

=61+2

=63

Answer 2

Answer:

1. Number of students in the class = 9

2. Average marks as computed initially = 61

3. Total marks = Average marks * number of students.

Hence, total marks of all 9 students computed with the initial average = 9 * 61 = 549

4. Score for one of the student was raised y 18. This will contribute to the total score of the class increasing by marks. Therefore, new total marks for the class of 9 students = 549 + 18 = 567

5. The new average =

New total / Number of students = 567 / 9 =

63

ANSWER . 63