Question

Suppose a bus arrives at a bus stop every 35 minutes. If you arrive at a bus stop at a random time, what is the probability that you will have to wait at least 20 minutes for the bus?

Answer 1

Think about it like this

say you had a number line that started at 0 and it incremented by 1 until you reached 35, so it would go: 0, 1, 2, 3, 4, ..., 33, 34, 35

now let's say these numbers represent how long you wait for the bus. So 0 represents 0 minutes (you arrive exactly when the bus does), 1 represents 1 minute, etc etc

how many of these numbers are equal to 20 or larger than 20?