A statistics teacher collected data on the last digit of her 50 students home or phone numbers. She remarked that the results were very similar to choosing 50 digits from a random digits table. The mean from the distribution was 4.5 in the stair deviation was 2.87. She then had her students take all possible samples of size 4 from the 50 pieces of collected data and compete the mean for each sample. They graph the sample and calculate the new Sarah deviation. What did the graph look like and what were the values of the new standard deviation?