180 students in a lecture hall can scream at 120 dB. Thus, we should expect that:
-360 average students can do 240 dB.
-the loudest student in the class can do 120 dB.
-360 average students can do 130 dB.
-an average student can do 0.67 dB by him or herself.

-18 average students can do 110 dB.
-90 average students can do 110 dB.