As estimated by the Pew Research Center in 2016, the probabilities associated with a randomly chosen American adult using Facebook and Twitter are shown in the following two-way table. 

a. What is the probability a randomly chosen American adult uses Facebook given he or she uses Twitter? 

b. What is the probability a randomly chosen American adult uses Twitter given he or she uses Facebook?

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Twitter Total Yes No Facebook Total Yes No 0.20 0.01 0.21 0.48 0.31 0.79 0.68 0.32 1.00