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 the college students are over 21 years
old.
What is the probability of drinking alcohol or being over 21 years
old?
Group of answer choices
0.66
0.24
0.90
0.42