Answer:
85.714285714
Step-by-step explanation:
Section A
15 students has a mean score of 80
The Total score of the 15 students =
15 × 80
= 1200
Section B
20 students had a mean score of 90
Total score of the 20 students =
90 × 20
= 1800
Total number of students = 15 + 20
= 35 students
Total scores of the 35 students (Section + Section B) = 1200 + 1800
= 3000
Hence, overall, the approximate mean score for all of the students on the quiz is calculated as
Total score of the students ins section A and B/ Total number of students
= 3000/35
= 85.714285714
Therefore, the approximate mean score for all of the students on the quiz is 85.714285714
