What does population geography study?

Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number. the probability that the locker code begins with a prime number is %. the probability that the last digit of the locker code is an odd number is %.

Look at the photo i can’t do geography

Hurry on the map above, arrow 1 points to a region where most people are