A class of 30 students appeared in a test. The average score of 12 students is 62, and that of the rest is 78. What is the average score of the class?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 71.6.
Total score of the first 12 students = 12 × 62 = 744
Remaining students = 30 - 12 = 18
Total score of the remaining 18 students = 18 × 78 = 1404
Total score = 744 + 1404 = 2148
Average score = 2148/30 = 71.6
Therefore, the average score of the class is 71.6.