In competitive shooting, you can always adjust the sights to remove any bias in your aim. Therefore, the most important aspect of a shooter is to have a low standard deviation in how you aim. Your friends Adam, Betty and Chris all claim that their standard deviations are less than 1cm when shooting from 100 meters away. To test them, you ask them to fire 10 shots each, for which you measured standard deviations of 1.28cm (Adam), 1.09cm (Betty) and 0.7cm (Chris). What can you say about their claims?