Evan forgot to study for his final exam. He guesses on every question. If the final...
Evan forgot to study for his final exam. He guesses on every question. If the final consists of 431 true/false questions, what is the probability that Evan gets exactly 235 questions right? Use Normal Approximation!
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Evan forgot to study for his final exam. He guesses on every
question. If the final...
Mary's Final Exam for Psychology has 10 True/False questions and 10 multiple choice questions with 4 choices for each answer. Assuming Mary randomly guesses on every question: **Write answers usi...
Mary's Final Exam for Psychology has 10 True/False questions and 10 multiple choice questions with 4 choices for each answer. Assuming Mary randomly guesses on every question: **Write answers using 3 decimal places* a.) What's the probability that she gets at least 8 of the 10 true/false questions correct? b.) What's the probability that she gets at least 6 of the 10 multiple choice questions correct? c.) If the multiple choice questions had 5 choices for answers instead of 4,...
A student takes an exam containing 18 true or false questions. If the student guesses, what...
A student takes an exam containing 18 true or false questions. If the student guesses, what is the probability that he will get exactly 15 questions right? Round your answer to four decimal places.
A student takes an exam containing 14 true or false questions. If the student guesses, what...
A student takes an exam containing 14 true or false questions. If the student guesses, what is the probability that he will get exactly 13 questions right? Round your answer to four decimal places.
A student takes an exam containing 11 11 true or false questions. If the student guesses,...
A student takes an exam containing 11 11 true or false questions. If the student guesses, what is the probability that he will get exactly 3 3 questions right? Round your answer to four decimal places.
5.) Oh no! Jordan forgot to study for a multiple choice quiz. He has no idea...
5.) Oh no! Jordan forgot to study for a multiple choice quiz. He has no idea what any of the correct answers are so he randomly guesses the answer for each question. There are 20 questions on the quiz, and each question has 4 possible choices, one of which is the correct answer. (a) (8 pts) Find the exact probability that Jordan correctly guesses the answers to more than 7 questions. (b) (8 pts) Find the mean (expected) number of...
A student takes an exam containing 18 true or false questions. If the student guesses, what...
A student takes an exam containing 18 true or false questions. If the student guesses, what is the probability that he will get less than 10 but more than 7 questions right? Round your answer to four decimal places.
A student takes an exam containing 18 true or false questions. If the student guesses, what...
A student takes an exam containing 18 true or false questions. If the student guesses, what is the probability that he will get less than 10 but more than 7 questions right? Round your answer to four decimal places.
An exam consists of 64 independent multiple-choice questions. For each question, there are five choices, with...
An exam consists of 64 independent multiple-choice questions. For each question, there are five choices, with only one being correct. Suppose a student randomly guesses the correct answer to each question. (a) What are the mean and standard deviation of the number of successful guesses? (b) Use the normal approximation to find the probability that the student will correctly guess at most 10 correct answers.
5. A student takes a multiple-choice exam where each question has 5 possible answers. He works...
5. A student takes a multiple-choice exam where each question has 5 possible answers. He works a question correctly if he knows the answer, otherwise he guesses at random. Suppose he knows the answer to 80% of the questions. (a) What is the probability that on a question chosen at random the student gets the correct (b) Given that the student gets the correct answer to this question, what is the probability answer? that he actually knew the answer?
A multiple-choice exam offers five choices for each question. Jason just guesses the answers, so he has probability 1/5 of getting any one answer right. One of your math major friends tells you that t...
A multiple-choice exam offers five choices for each question. Jason just guesses the answers, so he has probability 1/5 of getting any one answer right. One of your math major friends tells you that the assignment of probabilities to the number of questions Jason gets right out of 10 is (rounded to three decimal places):What is the expected number of right answers Jason will get if the test has 10 questions? A) 5 B)2.282 C) 2.493 D) 3.5 E)Can't tell...
Mary's Final Exam for Psychology has 10 True/False questions and 10 multiple choice questions with 4 choices for each answer. Assuming Mary randomly guesses on every question: **Write answers using 3 decimal places* a.) What's the probability that she gets at least 8 of the 10 true/false questions correct? b.) What's the probability that she gets at least 6 of the 10 multiple choice questions correct? c.) If the multiple choice questions had 5 choices for answers instead of 4,...
An exam consists of 64 independent multiple-choice questions. For each question, there are five choices, with only one being correct. Suppose a student randomly guesses the correct answer to each question. (a) What are the mean and standard deviation of the number of successful guesses? (b) Use the normal approximation to find the probability that the student will correctly guess at most 10 correct answers.
5. A student takes a multiple-choice exam where each question has 5 possible answers. He works a question correctly if he knows the answer, otherwise he guesses at random. Suppose he knows the answer to 80% of the questions. (a) What is the probability that on a question chosen at random the student gets the correct (b) Given that the student gets the correct answer to this question, what is the probability answer? that he actually knew the answer?
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