The median is the middle number within a given sequence.
To determine the median, I cross out the smallest number with the largest number until you can no longer do so.
I will set the numbers up from least to greatest for you.
3, 4, 5, 5, 5, 6, 7, 7, 8, 11.
Cross out the smallest with the largest.
4, 5, 5, 5, 6, 6, 7, 7, 8
5, 5, 5, 6, 6, 7, 7
5 , 5, 6, 6, 7
5, 6, 6,
6.
6 is your median.
The mode is the number that appears the most.
5 appears the most.
5 is your mode.
I hope this helps!