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It is known that 20% of female students at certain school wear a ring, 30% of...

It is known that 20% of female students at certain school wear a ring, 30% of female students at this school wear a necklace, and 10% of female students wear both a ring and a necklace.


The probability that a randomly selected female student at this school wears a ring or a
necklace or both is __________
The probability that a randomly selected female student at this school wears a ring given
that this student wears a necklace is___________
The probability that a randomly selected female student at this school wears a necklace
given that this student wears a ring is___________

Math   Statistics-And-Probability   
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