The following data show the number of passengers in cars at a school football game:
5, 3, 4, 5, 4, 4, 2, 3, 1, 3, 4, 4, 5, 5
The data have been organized into a dot plot, as shown below:
A dot plot with integers 1 to 5 is shown. It is labeled Passengers, and titled Passengers in Cars. There is 1 dot above 1, 1 dot above 2, 2 dots above 3, 5 dots above 4, and 4 dots above 5.
For which number are the data plotted incorrectly?