SOLUTION: I know this should be easy, but arrrgghhh..... A researcher is randomly selecting a sample for his experiment from a group of 30 highschool students, 20 college students and 10

Question 889266: I know this should be easy, but arrrgghhh.....
A researcher is randomly selecting a sample for his experiment from a group of 30 highschool students, 20 college students and 10 grad students. 60% of each group is female and 40% is male.
If a researcher selects a stratified random sample of n=10, how many will be highschool students? Among the highschool students selected in this random sample of 10, what is the probability of selecting a female?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
30 out of 60 are high school students
so 5 out of 10
6 out of 10 are female in each group
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