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.
Popular Answers. Mean and median are often presented both as descriptive statistics, but this is actally not the case. The median is a central value of the data. It is that value for which one expects half of the (possible or observed) values being smaller and the other half being larger. It is more a coincidence that the mean also is (often, but nor always!) quite in the center of the data, but its derivation is completely different.