Acertain deck of cards has cards that show one of five different shapes with equal representation, so that the probability of selecting any particular shape is 0.20. a card is selected randomly, and a person is asked to guess which card has been chosen. the attached graphs show a computer simulation of experiments in which a "person" was asked to guess which card had been selected in a large number of trials. each dot in the dotplots represents the proportion of successes for one person. one dotplot represents an experiment in which each person had 10 trials; another shows 20 trials; and a third shows 40 trials.
explain how you can tell, from the widths of the graphs, which has the largest sample (n=40) an which has smallest sample.