4. What is the marginal probability that a passenger survived the Titanic? How does this compare to the probability that a passenger survived given they were a 1*;1 class passenger? Survived Titanic: P(S)= 0.38, we know P(S;' 1): 0.6 The comparison shows us that 60% of the surviving 38% of passengers were om rst class. P(Sf 1) :> P(S)