The value in a data set that is quite different from the remaining values of the data set is known as .
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Solution
An outlier is that value of the data set which is quite different from the remaining values.
For example: The data for the sale of umbrellas on 6 consecutive days is recorded and depicted as follows:
Here, for most of the days the number of umbrellas sold lies within the range of 3 to 7, except for the value 20 which is very different from the other values.