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the table below shows the joint probability distribution for the number of drinks and the number of sandwiches customers purchase from a local delicatessen: sandwiches (s) 1 2 1 0.33 0.27 drinks (d) 2 0.17 0.23 3 0 ? [bmgt 230/230b fall 2022] are the number of drinks customers purchase and the number of sandwiches customers purchase statistically independent events?