Hey there :)
17 , 9 , 4 , 12 , 11 , 7 , 5
From least to greatest :
4 , 5 , 7 , 9 , 11 , 12 , 17
The median number is the middle number in any set of ordered numbers
Here we have 7 numbers, which is odd, so we will have a number in between
4 , 5 , 7 , 9 , 11 , 12 , 17
[tex]\boxed {The \ Median \ Number \ Of \ Patients \ is \ 9}[/tex]