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28) A multiple choice history exam contains 5 choices per question. Sally knows 90% of the...
question1: If events E, F & G are mutually independent, and P(E) = P(F) = P(G)...
question1: If events E, F & G are mutually independent, and P(E) = P(F) = P(G) = .3, then P(EF' | G) = a) .16 b) .18 c) .20 d) .21 e) .24 question2: A multiple choice history exam contains 5 choices per question. Sally knows 90% of the material that the exam covers. When she doesn’t know the answer to a question, she guesses. Determine the probability that Sally knew the answer to problem #17, given that she answered...
7. In answering a question on a multiple-choice test, a student either knows the answer or...
7. In answering a question on a multiple-choice test, a student either knows the answer or guesses. Let p be the probability that the student knows the answer and 1-p be the probability that the student guesses. Suppose there are 5 multiple-choice alternatives so a student who guesses at the answer will be correct with probability 1/5. (o) Show that the probability that a student knew the answer to a question given that he or she (b) What is the...
Exercise 1.4. On a multiple-choice exam with four choices for each question, a student either knows...
Exercise 1.4. On a multiple-choice exam with four choices for each question, a student either knows the answer to a question or marks it at random. Suppose the student knows answers to 70% of the exam questions. If she marks the answer to question 1 correctly, what is the probability that she knows the answer to that question?
Multiple-Choice Exam A student takes a 13-question, multiple-choice exam with two choices for each question and...
Multiple-Choice Exam A student takes a 13-question, multiple-choice exam with two choices for each question and guesses on each question. Find the probability of guessing at least 9 out of 13 correctly. Assume the variable is binomial. Round the intermediate and final answers to three decimal places. P (guessing at least 9 out of 13 correctly) = x
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?
Question 1 5 pts A multiple choice exam has 85 questions on it (4 choices each...
Question 1 5 pts A multiple choice exam has 85 questions on it (4 choices each question) What is the probability of getting 28 questions right on such an exam? Round your answer to four decimal places Question 2 5 pts A multiple choice exam has 94 questions on it (5 choices each question) What is the probability of getting 19 questions right on such an exam? Round your answer to four decimal places Question 3 5 pts Suppose Bobby...
3. [10 Points) Consider an exam with 28 multiple choice questions. Assume that each question has...
3. [10 Points) Consider an exam with 28 multiple choice questions. Assume that each question has three solution choices but only one of them is correct. A student who didn't study for the exam is going to make a guess. a. What is the probability that he guesses only 15 questions correctly? b. What is the probability that he guesses at least 15 questions correctly? c. What is the probability that he guesses more than 10 and less than 15...
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.
10 + Example 3: Multiple choice exam of multiple- choice questions, each with 5 possible answers....
10 + Example 3: Multiple choice exam of multiple- choice questions, each with 5 possible answers. L13, p. 89 Linda has probability 0.75 of knowing the answer to any question. If she does not know the answer she guesses. What is the probability she will give the correct answer? A= Linda knows the answer B=Linda gets the right answer how do you know?? GIVEN: P(A) = 0.75 P(BA) = 0.2 how do you know?? PAC) = 0.25 PCB{A) = 1...
please answer part B and C 3. [10 Points) Consider an exam with 28 multiple choice...
please answer part B and C
3. [10 Points) Consider an exam with 28 multiple choice questions. Assume that each question has three solution choices but only one of them is correct. A student who didn't study for the exam is going to make a guess. a. What is the probability that he guesses only 15 questions correctly? b. What is the probability that he guesses at least 15 questions correctly? c. What is the probability that he guesses more...
7. In answering a question on a multiple-choice test, a student either knows the answer or guesses. Let p be the probability that the student knows the answer and 1-p be the probability that the student guesses. Suppose there are 5 multiple-choice alternatives so a student who guesses at the answer will be correct with probability 1/5. (o) Show that the probability that a student knew the answer to a question given that he or she (b) What is the...
Multiple-Choice Exam A student takes a 13-question, multiple-choice exam with two choices for each question and guesses on each question. Find the probability of guessing at least 9 out of 13 correctly. Assume the variable is binomial. Round the intermediate and final answers to three decimal places. P (guessing at least 9 out of 13 correctly) = x
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?
Question 1 5 pts A multiple choice exam has 85 questions on it (4 choices each question) What is the probability of getting 28 questions right on such an exam? Round your answer to four decimal places Question 2 5 pts A multiple choice exam has 94 questions on it (5 choices each question) What is the probability of getting 19 questions right on such an exam? Round your answer to four decimal places Question 3 5 pts Suppose Bobby...
3. [10 Points) Consider an exam with 28 multiple choice questions. Assume that each question has three solution choices but only one of them is correct. A student who didn't study for the exam is going to make a guess. a. What is the probability that he guesses only 15 questions correctly? b. What is the probability that he guesses at least 15 questions correctly? c. What is the probability that he guesses more than 10 and less than 15...
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.
10 + Example 3: Multiple choice exam of multiple- choice questions, each with 5 possible answers. L13, p. 89 Linda has probability 0.75 of knowing the answer to any question. If she does not know the answer she guesses. What is the probability she will give the correct answer? A= Linda knows the answer B=Linda gets the right answer how do you know?? GIVEN: P(A) = 0.75 P(BA) = 0.2 how do you know?? PAC) = 0.25 PCB{A) = 1...
please answer part B and C
3. [10 Points) Consider an exam with 28 multiple choice questions. Assume that each question has three solution choices but only one of them is correct. A student who didn't study for the exam is going to make a guess. a. What is the probability that he guesses only 15 questions correctly? b. What is the probability that he guesses at least 15 questions correctly? c. What is the probability that he guesses more...
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