Use the following table, which shows the number of cars and trucks that used the Pennsylvania Turnpike on a particular day. The number of cars and trucks that used, and did not use, E-Z Pass on that same day was also recorded.

If one of these vehicles is randomly selected, determine the probability (as a decimal number rounded to four decimal places) that the vehicle

a) Is a truck.

b) Is a truck, given that the vehicle did not use E-Z Pass.

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E-Z Pass Cars Trucks Total Used 527 316 843 Did not use 935 683 1618 Total 1462 999 2461