Answer: D
Arranging the data in ascending order we get 4,5,6,9,10,11,18,20
Here, n=8
Therefore, the median is: \(\frac{1}{2}\) (4th term + 5th term)=\(\frac{1}{2}\) (9+10)=\(\frac{19}{2}\) =9.5
Arranging the data in ascending order we get 4,5,6,9,10,11,18,20
Here, n=8
Therefore, the median is: \(\frac{1}{2}\) (4th term + 5th term)=\(\frac{1}{2}\) (9+10)=\(\frac{19}{2}\) =9.5