7. A department store sells sport shirts in three sizes (small, medium, and large), three patterns (plaid, print, and stripe), and two sleeve lengths (long and short). The accompanying tables give the proportions of shirts sold in the various category combinations: Short-sleeved Size S M L PI .04 .08 .03 Long-sleeved Pattern Pl .03 .10 .04 Pr .02 .07 .07 Pattern Pr .02 .05 .02 St .05 .12 .08 Size S M L a. What is the probability that the next shirt sold is a short-sleeved shirt? A long-sleeved shirt? b. What is the probability that the size of the next shirt sold is medium? That the pattern of the next shirt sold is a print? St .03 .07 .08

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