There are 500 students in a high school senior class. Of these 500 students, 300 regularly wear a necklace to school, 200 regularly wear a ring, and 125 regularly wear a necklace and a ring. Using this information, answer each of the following questions.
Let N be the event that a randomly selected senior regularly wears a necklace and R be the event that a randomly selected senior regularly wears a ring.
What is P(N), the probability that a senior wears a necklace?
What is P(R), the probability that a senior wears a ring?
What is P(N and R)P, the probability that a senior wears a necklace and a ring?
What is P(N or R), the probability that a senior wears a necklace or a ring?
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- P(R)=n÷s
=300÷500
- =3/5
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