(03.02 mc)
students at warlock high are allowed to sign up for one social studies class each year. the numbers in each grade level signing up for various classes for the next school
year are given in the following table:

part a: what is the probability that a student will take civics? (2 points)
part b: what is the probability that a 10th-grader will take either us history or world history? (2 points)
part c: what is the probability that a student will take economics given that he or she is in the 10th grade? (2 points)
part d: consider the events "a student takes civics' and 'a student is a 12th-grader." are these events independent? justify your answer. (4 points) (10 points)