An advertising agency in a large city of conducting a survey of adults to investigate whether there is an association between the highest level of educational achievement and primary source for news. The company takes a random sample of 2500 adults in the city. The results are shown in the table below.

for News But Not College Graduate College Graduate Graduate Total Newspapers 49 Local television 205 90 188 442 170 Cable television 75 113 335 Internet 496 147 41 756 None 401 245 77 687 165 Total 38 280 370 1,437 693 2,500 (a) If an adult is to be selected at random from this sample, what is the probability that the selected adult is a college graduate or obtains news primarily from newspapers? (b) If an adult who is a college graduate is to be selected at random from this sample, what is the probability that the selected adult obtains news primarily from newspapers? (c) When selecting an adult at random from the sample of 2,500 adults, are the events "is a college graduate" and "obtains news primarily from newspapers" independent? Justify your