The number of days that it takes the post office to deliver a letter from City A to City B has the following probability distribution, where some probabilities are missing: # of Days Probability 2 3. 4 6. 0.08 ??? 0.36 ??? 0.17 0.04 You send a letter from City A to your grandmother in City B. What is the probability that it takes an even number of days to be delivered? 0.37 0.39 0.35 impossible to determine without at least one of the missing probabilities impossible to determine without both of the missing probabilities