A common examination was taken by two sections of Class IX. 20 students of one…
2016
A common examination was taken by two sections of Class IX. 20 students of one section secured an average grade of 80%, while 30 students of the other section secured an average grade of 70%. What is the average grade of the students of both sections of Class IX combined?
- A.
72%
- B.
76%
- C.
74%
- D.
78%
Attempted by 2 students.
Show answer & explanation
Correct answer: C
1. Calculate the total sum of grades for section 1: 20 students × 80 = 1600. 2. Calculate the total sum of grades for section 2: 30 students × 70 = 2100. 3. Divide the sum of total grades by the total number of students: (1600 + 2100) / (20 + 30) = 3700 / 50 = 74%. Final Answer: Option C