For this part, I think you miss where it says "Sum of BB Baby Bug Counts" divided by the "Number of Data Runs" Note: data run is 10 "Let's perform these calculations: Total Counts Total BB Baby Bug Count: 3 + 3 + 7 + 10 + 12 + 13 + 17 + 21 + 23 + 26 = 135 Total Bb Baby Bug Count: 4 + 13 + 18 + 24 + 30 + 37 + 42 + 46 + 51 + 56 = 321 Total bb Baby Bug Count: 3 + 4 + 5 + 6 + 8 + 10 + 11 + 13 + 16 + 18 = 94