miss11thgrade, there isn't actually enough information here for me to answer sufficiently.
I can tell you that if a billion samples of n=400 were taken, then the distribution of sample ranges is close to approaching 400. This is because as the samples taken approaches infinity-- where here, it appears to-- the relative distribution (n=400) approaches the frequency distribution. This means that if you take enough samples, every data point will be suficiently different, and you will have 400 data points.
If there were a picture associated with this, I can answer this question more specifically :)
May 23rd, 2015
Let's continue this conversation here. These questions place a 20 minute limit on the first response, so I had to respond with what info I had.
Now, however, we can continue. Was there a picture associated with this question?