Raman has a certain average after 9 innings. In the 10th inning, he scores 100 runs, thereby increasing his average by 8 runs. His new average is ________.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 28.
We know that,
Average = Sum of observations/Number of observations
Let's assume the average of Raman in 9 innings = x
Now, According to the question
⇒ (9x + 100)/10 = x + 8
⇒ 9x + 100 = 10x + 80
⇒ x = 20
So, his new average = (9 × 20 + 100)/10 = 28