1 Record or upload your video. 2  At the end of the video processing stage in the upload interface, you will see an option to choose a Custom thumbnail under the Video thumbnails section. 3  Go to your channel Video Manager. 4  Locate a video and click the Edit button. 5  Click the Custom thumbnail button and upload a thumbnail.
Median is the middle number of a given dataset (if itÃÂ­s odd) while average is a definition of arithmetic mean, which is the most oft-cited average. The value of median depends on the number of elements in a data set (odd or even) while average does not.
A Simple Median vs. Mean Example: Hereâs one I like to use when describing the difference in practical terms. 1  You live in a town of 1000 residents who are all earning roughly $80,000 per year.  To keep it simple, the median and the mean are roughly $80,000 give or take.