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.
The mean is the average you're used to, where you add up all the numbers and then divide by the number of numbers. The median is the middle value in the list of numbers. To find the median, your numbers have to be listed in numerical order, so you may have to rewrite your list first.The mode is the value that occurs most often. If no number is repeated, then there is no mode for the list. The range is just the difference between the largest and smallest values.he median is the middle value. In a list of ten values, that will be the (10 + 1) Ã· 2 = 5.5 th value; that is, I'll need to average the fifth and sixth numbers to find the median: (10 + 11) Ã· 2 = 21 Ã· 2 = 10.5. The mode is the number repeated most often.