Cars arrive to a service center randomly and independently at a rate of 5 per hour on average, what is the probability of 0 cars arriving in a given hour?

0.0067 is the probability of 0 cars arriving in a given hour. And when you are asked also of what is the probability that exactly 5 cars will arrive during a given hour the answer is 0.1755. The probability of 0 cars will be arrive in a given hour is 0.0067.

Yes, two vertical lines can be complementary

+1,000)=g7e=mc2-g=7 because if you know algebra you should know g=7 to get your answer