Answer
P(at least two rooms) $=0.995$
If we randomly select 1000 U.S. housing units, we would expect about 995 to be a housing unit that has at least two rooms.
Work Step by Step
The event "a housing unit has at least two rooms" is the complement of the event "a housing unit has one room". So:
P(at least two rooms) = 1 - P(one room) =
$=1-0.005=0.995.$
