Bacteria and pH Graph

One milliliter of a solution containing an evan distribution of a species of bacterium was spread on the surface of a nutrient medium in each of 5 culture dishes. THe nutrient medium in each dish was the same, except for pH. The dishes were then incubated at 37 degrees C for 24 hours. The number of bacterial colonies in each dish was then counted, and the results are represented in the data table below.