The average marks scored by a student in 4 subjects is 75. But when the marks of English are added to it, the overall average became 70. How much did he score in English?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 50.
We know that,
Average = Sum of observations/Number of observations
Now, According to the question
If the average of 4 subjects is 75, then
Total marks scored in these 4 subjects = 75 × 4 = 300
When marks of English are added, the average becomes 70. Thus,
The total marks obtained by these 5 subjects = 70 × 5 = 350
Thus,
The marks in English = 350 - 300 = 50