Answer
$11$
Work Step by Step
The median of $n$ numbers is the middle number of the numbers when they are in order (and the mean of the middle $2$ numbers if $n$ is even).
The data items in decreasing order are: $33, 27, 27, 23,11,10, 9, 7, 6$
Here we have $9$ items, thus the median will be the $5$th item, which according to the list is: $11$
