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70 percent of students at a certain school wear neither a ring nor a necklace. 15...

70 percent of students at a certain school wear neither a ring nor a necklace. 15 percent wear a ring and 25 percent wear a necklace. If one of the students is chosen randomly, what is the probability that this student is wearing (a) a ring or a necklace? (b) a ring and a necklace?

Math   Statistics-And-Probability   
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Answer #1

(a)Probability a ring or a necklace =0.30

(b)Probability a ring and a necklace =0.10

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