The National Household Travel Survey gathers data on the time of day when people begin a trip in their car or other vehicle. Choose a trip at random and record the time at which the trip started. Here is an assignment of probabilities for the outcomes:

a. What probability should replace “?” in the table? Why?

b. Find the probability that the chosen trip did not begin between 9 A.M. and 12:59 P.M.

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Time of day 10 РМ.-12:59 А.М. 1 А.М.-5:59 А.М. бАМ.-8:59 А.М. Probability 0.040 0.033 0.144 Time of day 9 А.М.-12:59 Р.М. 1 РМ.-3:59 Рм. 4 РМ.-6:59 РМ. Probability 0.234 0.208 Time of day 7 РМ.-9:59 РМ. Probability 0.123