Basic numeracy

In order to assess depictions of aggression in primetime television, a researcher plans to conduct a quantitative content analysis of representations of aggression in primetime sitcoms. In order to do so, she counts the number of instances of aggression in 5 different sitcoms (S1-S5) over five days from 20:00 to 23:00. Table 1 shows the researcher’s results. What is the difference between S1 and S4 in terms of total instances of aggression?