Final answer:
The average volume of John's three lab trials is calculated by summing up the measurements and dividing by the number of trials, resulting in 15.9 mL. This is answer option A) 15.9 mL.
Step-by-step explanation:
The average volume for the three lab trials performed by John can be calculated by adding the volumes of each trial and then dividing the sum by the number of trials. The sum of the individual volumes (13.4 mL + 15.0 mL + 19.2 mL) equals 47.6 mL. To find the average volume, we divide this sum by the number of trials, which is 3.
The calculation would be: Average Volume = (13.4 mL + 15.0 mL + 19.2 mL) / 3
= 47.6 mL / 3 = 15.8667 mL,
which we can round to 15.9 mL.
Therefore, the correct answer is A) 15.9 mL.