During science class, groups measure out different volumes of vinegar. The line plot below shows the amount of vinegar used by 121212 groups, rounded to the nearest \dfrac12 \text{ mL} 2
1

mLstart fraction, 1, divided by, 2, end fraction, start text, space, m, L, end text.

What is the total amount of vinegar, in milliliters, used by the 333 groups that used the most?