We have the following data set: {245, 253, 220, 241, 282, 234, 236, 249}
The mean value is 245.
The standard deviation is 18 (rounded)
An outlier is any data that diverges significantly from the majority of the data set.
If we consider as outliers every data that distances from the mean in more than one standard deviation, then the outliers will be any data less than 227 or greater than 263
Therefore, the outliers are 220 and 282.