In 100 hands or a little bit more than a shoe any statistic will be within +/- 15 in either direction by random chance.  What that means if you simply guess you will win anywhere in between 15 units plus or minus.  99.73% of all the samples of 100 hands no matter in a shoe or consecutive, or sampled will reflect this statistic.

As the example showed, based on  thousands of hands the variance will be less based on a few hands variance will be at its greatest.