Both of the following lists of n 8 data values have a mean of 20:
List 1: 10, 10, 10, 10, 30, 30, 30, 30
List 2: 10, 15, 19, 20, 20, 21, 25, 30
Draw a dotplot comparing the two data lists and explain how the plot shows that the standard deviation for List 1 is greater than the standard deviation for List 2.