Answer
$P(at~least~7)=0.882$
On about 882 of every 1000 3 miles of randomly selected highway, there will be at least 7 potholes.
Work Step by Step
The probability that there will be at least 7 potholes over 3 miles of randomly selected highway is the complement of the probability that there will be fewer than 7 potholes over 3 miles of randomly selected highway.
Using the Complement Rule (see page 275):
$P(at~least~7)=P(x\geq7)=1-P(x\lt7)=1-0.118=0.882$
