The average score of 25 students in a test is 68. The top 5 scores had an average of 80, and the lowest 5 had an average of 50.

You have given:

• Average of 25 students = 68
• Average of top 5 = 80
• Average of lowest 5 = 50

But what needs to be found is missing (most likely: average of remaining 15 students).

If we assume the question is:
👉 Find the average of the remaining 15 students

Total marks of 25 students
$= 25 \times 68 = 1700$

Total of top 5
$= 5 \times 80 = 400$

Total of lowest 5
$= 5 \times 50 = 250$

Sum of remaining 15 students
$= 1700 - (400 + 250) = 1700 - 650 = 1050$

Average of remaining 15 students
$= \frac{1050}{15} = 70$

Final Answer: 70 ✅