UPSC CDS 2 2020 Math Paper

We have, the marks of 10 passed students are 9,6,7,8,8,9,6,5,4 and 7.
In ascending order , 4,5,6,6,7,7,8,8,9,9.
And appeared students = 15
So, number 15 is odd then median is the value of (

15+1

2

)th means 8th observations.
but we don’t have the marks of 5 failed students which are obviously marks less than 4.
So including the unknown 5 observations , 8th observations is 6.