SOLUTION: A student is taking a MC test in which the question has four possible answers. She knows the answers to 50%, can narrow choices down to two for 30% of the time, and does not know
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Question 260803: A student is taking a MC test in which the question has four possible answers. She knows the answers to 50%, can narrow choices down to two for 30% of the time, and does not know anything about 20% of the questions. What is the probability she will correctly answer a question chosen at random from thw test? Answer by Greenfinch(383) (Show Source):
You can put this solution on YOUR website! Certain 50% = 0.5 x 1 = 0.5
Likely 30% = 0.3 x 0.5 = 0.15
Possible 20% = 0.2 x 0.25 = 0.05
Total is 0.7 or 70%
