Posted by PetarI on Monday, November 19, 2012 at 8:17pm.
Over time, a student analyzes her ability to guess correctly after narrowing down multiple choice answers in a 5selection question (a through e). She discovers that if she narrows her answers to 2 or 3 choices, her probability of getting the right answer is 0.8, but if she still has 4 or 5 choices left, her probability of choosing correctly decreases drastically to 0.1. Assuming that in general she can narrow his choices to 23 choices 70% of the time, answer the following probability questions.
a. What is the probability that she will answer a question correctly any time she must guess?
b. Given that the student answered correctly, what is the probability that she had narrowed her choices to 23?

Statistics  Anonymous, Tuesday, December 16, 2014 at 10:46pm
20%
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