Determining the median requires first arranging the given set of numbers 4, 11, 6, 9, 23, 34, 6, 19 in ascending order: 4, 6, 6, 9, 11, 19, 23, 34.
If the count of numbers is odd (as it is here), then the middle number (here, 11) is the median.
If the count is even, then take the mean (average) of the two middle numbers. That will be the median.
None of the answer choices match this outcome (11). Ensure that you have copied down the set of numbers completely and accurately.