a gas station is running a promotion where they offer to check your oil while you fill up with gas. if your car is low on oil, they will add a quart...

a gas station is running a promotion where they offer to check your oil while you fill up with gas. if your car is low on oil, they will add a quart for free. suppose that the probability that a car will need to have a quart of oil added is 30%. if 10 cars pull into the gas station, what is the probability that: exactly 1 will need to have a quart of oil added? at most 3 will need to have a quart of oil added? fewer than 5 will need to have a quart of oil added?