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Question

The table below gives the distribution of students at a certain high school for two categoricalvariables, grade

year and the student's answer to the question, "Do you eat regularly in the school cafeteria?"


a) If you choose a student at random, what is the probability he or she eats regularly in the cafeteria? b) If you choose a student at random, what is the probability he or she eats regularly in the cafeteria, given that he or she is in 10th grade?

c) If you choose a student at random, are the events "10th grade" and "eats regularly in the cafeteria"independent? Explain how you know.


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