Question

In a history examination, the average for the entire class was 80 marks. If 10% of the students scored 95 marks and 20% scored 90 marks, what was the average marks of the remaining students of the class? Select one: a. 72.5 b. 65.5 c. 85 d. 75

Answer 1

option d is your answer

Answer 2

Answer:

Step-by-step explanation:

Let the number of students in the class be 100

Let this required average be x.

Then, (10 * 95) + (20 * 90) + (70 * x) = (100 * 80)

=>950+1800+70 x =8000

=> 70 x = 8000 - (950 + 1800) = 5250

=> x = 75.