An experiment was run on laboratory mice to see the effects of drugs A, B, and C on their ability to see improvements in night vision. The results of the experiment are shown below. Using - test methodology, find the so-called Expected value for the upper left (N,A) cell. Experiment Results Table Drug A B C Totals Improve N 40 30 20 90 Y 20 10 30 60 Totals 60 40 50 150 Group of answer choices 16 20 24 30 36