A company that sells plastic covers for CDs, DVDs, and Blu-ray disks offers 6 different models, which differ from each other according to measurements for the length and the height. All the covers have the same thickness. An engineer who works for the company had come up with a nice table for the joint p.m.f. f(:.-:, y) of two random variables X, the height in inches of the plastic cover sold, and Y , the length in inches of the plastic cover sold. Unfortunately, however, he has spilled coffee on it, and now some of the entries are blurred. x, y) X : 4.7 X : 10.75 X : 13 Pr(Y : y) Pr(X : 3:) T? 0.70 0.10 '3'? Knowing that a CD plastic cover is the only plastic cover that has a square format, i.e., equal height and length, and this is the only format in which these CD covers are sold, find the probability that the company will sell a CD plastic cover