SOLUTION: In exercises 6-8, one student is selected at random from a group of 12 freshman, 16 sophomores, 20 jouniors, and 2 seniors. find the probability that the person selected is ...

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Question 181509: In exercises 6-8, one student is selected at random from a group of 12 freshman, 16 sophomores, 20 jouniors, and 2 seniors. find the probability that the person selected is ...
6. a freshman
7. not a sophomore.
8. a junior ro a senior
Answer by Mathtut(3670) About Me  (Show Source):
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6)P(f)=12/50=6/25
:
7)P(~so)=34/50=17/15
:
8)P(j or s)=P(j)+P(s)=20/50+2/50=22/50=11/25