Multiple-Choice Test 2: Suppose that you are taking your College Board tests. You answer all the questions you know, and have some time left over. So you decide to guess the answers to the rest of the questions. a. Each question is multiple choice with five choices. If you guess at random, what is the probability of getting an answer right? Of getting an answer wrong? b. When the testing service grades your paper, they give you 1 point if the answer is right and subtract point if the answer is wrong. What is your mathematically expected score on any question for which you guess at random? c. Suppose that, on one question, you can eliminate one choice you know is wrong, and then randomly guess among the other four. What is your mathematically expected score on this question? Surprisingly low, isnt it? d. Calculate your mathematically expected score on a question for which you can eliminate two of the choices and then for which you can eliminate three of the choices. e. Based on your answers, do you think it is worthwhile guessing answers on a multiplechoice test?

Persia Tuesday, March 19:36 PM Indo-European Language Migration When the Indo-Europeans (Persians ) moved into modern day Iran, they had the same concepts as the Hindus. So the Persians actually built their own 3 level caste system with farmers at the bottom. Persian (Achaemenid) Rulers • Cyrus II "the Great" r. 558-539 b.c. Created a unified system of laws, largest trade network, the largest road system in the world, beating the romans, common weights, commonmoney, common language. • He built a canal connecting to the Nile Delta. This was a massive trading network, and they left their collective countries to governthem