A true-false test has 5 questions. What is the probability of getting at least 4 wrong by guessing all the answers?
probability of getting at least 4 wrong by guessing all the answers
=P(4 wrong)+P(5 wrong) =(5C4)*(1/5)4*(4/5)+(5C5)*(1/5)5*(4/5)0=20/3125+1/3125 =21/3125
A true-false test has 5 questions. What is the probability of getting at least 4 wrong...
What is the probability that you will get at least 20 true/false questions correct on a quiz with 36 questions if you are just guessing.
A true/false test has 60 questions. A passing grade is 56% or more correct answers. a. What is the probability that a person will guess correctly on one true/false question? b. What is the probability that a person will guess incorrectly on one question? c. Find the approximate probability that a person who is just guessing will pass the test. d. If a similar test were given with multiple-choice questions with four choices for each question, would the approximate probability...
A true/false test has 30 questions. A passing grade is 70% or more correct answers. Answer_____(Type an integer or a decimal.) a. What is the probability that a person will guess correctly on one true/false question?Answer________ b. What is the probability that a person will guess incorrectly on one question?Answer________ c. Find the approximate probability that a person who is just guessing will pass the test.Answer________ d. If a similar test were given with multiple-choice questions with four choices for...
Suppose Jon is taking a test with 5 true-false questions and 5 multiple questions with 4 choices each. He knows nothing so he will answer randomly a) find the expected number of true-false questions he will answer correctly? b) Find the probability that Jon answers exactly 7 questions correctly? c) Find the expected number of total of questions he will answer correctly ?
Several archeology students are unprepared for a surprise true/false test with 13 questions, and all of their answers are guesses. Find the mean for the number of correct answers for such students. (Round answer to one decimal place.) μ = Find the standard deviation for the number of correct answers for such students. (Round answer to two decimal places.) σ = Give the range for the usual number of correct answers. (Enter answer as an interval using square-brackets only with...
A multiple choice test is given, in which each question has 5 possible answers. As part of an experiment in how students approach test-taking, the probabilities for getting answers correct just by guessing are calculated. If the test has 20 questions, what is the probability of getting 4 questions correct
Steve is about to write a test with 10 true or false questions and 15 multiple choice questions. Steve has been studying hard so we’ll give a 75% chance of getting any of the 25 questions right. Assume all the questions are independent of each other. (a) (2 points) What is the probability that Steve gets exactly two thirds of the multiple choice questions right? (b) (3 points) What is the probability that Steve gets exactly half the true or...
A true-false test consists of twelve questions. If you guess the answer to each question, what is the probability of getting all twelve questions correct? 0.0687 0.0002 0.0317 0.0319
What is the probability that Sue gets a B grade of at least 4 out of 5 on a 5-question multiple choice test (with answers A - D for each question) by guessing at random? What is the sample space? What are the events that satisfy the condition of at least 4 out of 5 correct answers?
A test consists of 10 true/false questions. To pass the test a student must answer at least 6 questions correctly. If a student guesses on each question, what is the probability that: a. the student will pass the test b. the student will fail the test c. the student will get a 100 (all questions will be answered correctly)