Can someone please explain this to me?

Ineed with number 17 i don’t get it at alll

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?