Abreath analyzer, used by the police to test whether drivers exceed the legal limit for blood alcohol percentage while driving, is known to satisfy p ( a | b ) = p ( a c | b c ) = p where a is the event "breath analyzer indicates that legal limit is exceeded" and b is the event "driver's blood alcohol percentage exceeds legal limit." on saturday night, about 5% of all drivers are known to exceed the limit. if we want p ( b | a ) to equal 0.9, what value of p should we use, rounded to 4 decimal places? group of answer choices