olindeanna14
Answered

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At the beginning of the semester, a professor tells students that if they study for the tests, then there is a 55% chance they will get a B or higher on the tests. If they do not study, there is a 20% chance that they will get a B or higher on the tests. The professor knows from prior surveys that 60% of students study for the tests. The probabilities are displayed in the tree diagram.


A tree diagram. Random student studies for test is 0.6, and does not study for test is 0.4. Studies for test to Gets B or higher is 0.55; does not get B or higher is 0.45. Does not study for test to Gets B or higher is 0.20; does not get B or higher is 0.80.


The professor informs the class that there will be a test next week. What is the probability that a randomly selected student passes the test with a B or higher?


0.33

0.41

0.55

0.75

Sagot :

Answer:

i think it is 0.33 probably wrong

Step-by-step explanation:

i  am proably wrong

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