researchers are investigating the effect of ph level in water on the breeding habits of the moon jellyfish. as part of a laboratory experiment, they will randomly assign one of three treatments, low ph, medium ph, or high ph, to the water in the tanks that hold the jellyfish.

Arecent 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. the probability of drinking or being over 21 years old is