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.
An average can be described in many ways. Aside from expressing it as the mean of the sample, it can also be given as the median or the mode. Median is the central point of the set. In statistics, it is usually the number that occurs in the middle of a set of numbers. A description of the average can be in the median, some of the time, if it is considered as the most suitable way to describe the central tendency of a particular sample. The mode is the value that occurs most frequently in a data set.