Question 1009543
.
tenth grade=(86/255)(100%)=33.7%
eleventh grade=(18/51)(100%)=35.3%
twelfth grade=100%-(33.7%+35.3%)=100%-69%=31%
ANSWER: One student chosen at random is most 
likely in the eleventh grade, because eleventh 
grade is the highest percent of the student body.