In an attempt to decrease drunk driving, police set up vehicle checkpoints during the July 4 evening. The police randomly select vehicles to be stopped for “informational” checks. On a particular roadway, assume that 20% of all drivers have a blood alcohol level above the legal limit. For a random sample of 15 vehicles, compute the following probabilities:
a. All 15 drivers will have a blood alcohol level exceeding the legal limit.
b. Exactly 6 of the 15 drivers will exceed the legal limit.
c. Of the 15 drivers, 6 or more will exceed the legal limit.
d. All 15 drivers will have a blood alcohol level within the legal limit.