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A recent survey shows that the probability of a college student drinking alcohol is 0.6. Further,...

A recent survey shows that the probability of a college student drinking alcohol is 0.6. Further, given that the student is over 21 years old, the probability of drinking alcohol is 0.8. It is also known that 30% of students are over 21 years old. Of the students who are not over 21, what is the probability they drink alcohol?

A. 0.5143

B. 0.4857

C. 0.36

D. 0.24

Please show every step and explain.

math   Statistics-And-Probability   
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