An outlier is a data point that is radically different from all the other points. Mean is the average of a selection of data points. Median is hard to explain there's probably an answer on this site...
Most cases professional you will want to use mean. If you want a simpler answer use median.
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MEAN
If you ask what is the most popular dish served in the restaurant you are seeking the mode.
mean is the average of numbers in the data set mode is the most frequently occurring value in a data set and median is the middle number of the data set so you would use mean
to work out various different types of averages
Mean is the average you add all the numbers and divide the total by the number of numbers that you added. you would use it rather thank median and mode basically when it asks you to find the mean or to find the average