statistics

posted by .

If a student takes an exam containing 12 true or false questions. If the student guesses what is the probability that he will get exactly 8 questions right?

  • statistics -

    what is (1/2)^12 * 12!/8!4!

    I get about 1/8

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Statistics

    A student is taking a multiple-choice exam with 16 questions. Each question has five alternatives. If the student guesses on 12 of the questions, what is the probability she will guess at least 8 correct?
  2. Math

    10 multiple choice questions each with three possible answers only one of which is correct. A student guesses the answer to every question. (a)What is the probability that the student will answer the first six questions correctly and …
  3. Statistics

    A student studies for a statistics exam where all questions are true or false. A reputable source indicates that with studying the student has a 90% chance of answering each question correctly. There are only three questions on the …
  4. advanced statistics

    suppose a student takes a multiple choice test with 10 questions. suppose each question has 4 possible answers. if the student guesses randomly on each questions,what is the probability that the student gets exactly 6 correct?
  5. Statistics

    A student is taking a true/false exam with 15 questions. If he guesses on each question, what is the probability he will get at least 13 question right?
  6. math

    11. A Certification Exam containing 20 true and false questions. If a student guesses at the answer to each question, what is the probability that she/he will get exactly 14 correct?
  7. statistics

    A student takes an exam containing 14 multiple choice questions. The probability of choosing a correct answer by knowledgeable guessing is 0.5. At least 9 correct answers are required to pass. If the student makes knowledgeable guesses, …
  8. Math

    A student takes a true-false test exam with 10 questions. If the student guesses all ten questions, find the probability he gets 7 or 8 right. p(x=7) + p(x=8) (.5)^7(.5)^3 + (.5)^8(.5)^2 I have the correct answers which are .117+.044= …
  9. math

    a student takes up a True or false exam of 10 questions. he is completely unprepared and so he starts guessing randomly. he may toss a coin and use the outcome to determine the guess. compute the probability that he guesses correctly …
  10. statistics

    a student takes a true false test that has 13 questions and guesses randomly at each answer. Let X be the number of questions answered correctly. Find P(fewer than 4)

More Similar Questions