It is an extreme in a group of numbers.They are much smaller or bigger than the group of numbers. For example, in:
5
6
8
7
5
4
15
15 is obviously an outlier as it is very much higher than the rest of the numbers..
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Yes there can be more then one outlier
If is does not cluster with the other points on a plot. example; the asterik is the outlier ........ ... ...... ...... .. ........ .. ...... ... .. . ...... __________* .. .. . . . . . .. ..
If the outlier is excluded the median of the data will be higher.
An outlier can make the range go up.Example:say you have the numbers. 2,5,4,1,7,and 18.in order from least to greatest: 1,2,4,5,7,18range is the greatest number - the littlest number.so in this case it is 18-1 which equals 17say if there was no outlier and the highest number was 7it would be 7-1 which is 6 and it makes the outlier smaller....
There would be a difference to the median. The old number wouldn't be the median but the mode wouldn't change. If the outlier is a high value, it will cause the mean value to shift to the higher side, while a low valued outlier will drop the mean value to a lower number.