Question

Your original grades on your exams were: 75, 85, 90, 90, 100, 75, 80, 100, 90. You retake the exams and now your scores are: 85, 85, 100, 90, 100, 85, 80, 100, 90. By how many percentage points did you improve your average score?​

Answer 1

Answer:

Your average improved by 13 $\frac{1}{3}$ %.

Step-by-step explanation:

First set:

(75 + 85 + 90 + 90 + 100 + 75 + 80 + 100 + 90) ÷ 9 = 77 $\frac{2}{9\\}$ %

Second set:

(85 + 85 + 100 + 90 + 100 + 85 + 80 + 100 + 90) ÷ 9 = 90 $\frac{5}{9}$ %

Improvement:

90 $\frac{5}{9}$ % - 77 $\frac{2}{9\\}$ % = 13 $\frac{1}{3}$ %