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1) A university requires a student to take a math placement test
and a computer science placement test.
80% of the students who take both tests pass either the math or the science test.
60% pass the math, and 40% pass the science.
What is the probability that the student will pass both?
. . . . .
Your answer to #2 is correct!
Let: = stock A rises, = stock B rises.3) Jason owns two stocks.
There is an 80% probability that stock A will rise in price,
while there is a 60% probability that stock B will rise in price.
There is a 40% chance that both stocks will rise in price.
Are the stocks independent?
If the events are independent, then: .
. . We are given: .
. . And: .
No, they are not independent.