Can someone plz give brainliest to best answer

A. Not really. The sample excludes people leaving the school at other times, like those involved in extracurricular activities. 
b. The question is biased. The use of the word "lengthy" implies that the day is too long and should be shortened, potentially affecting the students' answers. 
c. Roughly 5.6% (rounded to the tenths place)

45 this is because of the agarose