If you click on the "Exclude" button in the picture you posted, you will get the option to set lower and upper limits to exclude values outside certain ranges.
Alternatively, when you specified the dataset initially, you had the option to use a "censor" vector to exclude any data values you want.
I must say, though, that those extreme scores don't look like outliers to me--they look too regular. Instead, my guess is that the true distribution isn't normal but rather some distribution with heavier tails--maybe a Weibull, for example. So, I would recommend trying fits of all the data to some of the other distribution options
