Statistics

Over time, a student analyzes her ability to guess correctly after narrowing down multiple choice answers in a 5-selection question (a through e). She discovers that if she narrows her answers to 2 or 3 choices, her probability of getting the right answer is 0.8, but if she still has 4 or 5 choices left, her probability of choosing correctly decreases drastically to 0.1. Assuming that in general she can narrow his choices to 2-3 choices 70% of the time, answer the following probability questions.

a. What is the probability that she will answer a question correctly any time she must guess?

b. Given that the student answered correctly, what is the probability that she had narrowed her choices to 2-3?

  1. 👍
  2. 👎
  3. 👁
  1. 20%

    1. 👍
    2. 👎
  2. 59% - Verified

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    a multiple choice test has 8 questions with 4 possible answers for each question. if a student were to guess the answer to each question how many different ways would there be to answer the test A. 32 B. 4 C. 65 536 D. 4 096

  2. Math

    Find the odds against correctly guessing the answer to a multiple choice question with 6 possible answers.

  3. Math

    A multiple-choice test has four possible answers for each question. If a student guesses at the answer, what is the probability that he or she selects the correct answer

  4. Statistics Algebra 2

    A 10-question multiple choice test has 4 possible answers for each question. A student guesses on all ten answer. a)What is the probability that the student selects at least 6 correct answers? b)Is getting exactly 10 questions

  1. statistics

    A multiple choice test has 20 questions with each having 4 possible answers with one correct. Assume a student randomly guesses the answer to every question. 1) What is the probability of getting exactly 9 correct answers? 2)What

  2. MATH Prob.

    Find the probability of correctly answering the first 4 questions on a multiple choice test if random guesses are made and each question has 3 possible answers. A) 4/3 B) 1/81 C)1/64 D)3/4 I automatically think D.

  3. stadistic

    If a student randomly guesses at 15 multiple-choice questions, find the probability that the student gets exactly seven correct. Each question has four possible choices

  4. 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? Assume all of the

  1. Statistics

    1)A quiz consists of 8 multiple choice questions, each with 5 possible answers. If random guesses are made for all 8 questions, find the probability that a student will answer exactly 5 correctly. A. 0.999 B. 0.009 C. 0.990 D.

  2. Statiatics

    A student ran out of time on a multiple choice exam and randomly guessed the answers for two problems. Each problem had 5 answer choices a, b, c, d, e and only one correct answer. What is the probability that she answered neither

  3. probability

    a multiple choice test consists of 8 questions, each with 4 possible answers but only one of which is correct.what is the probability that an unprepared student will, by chance, get, a. all correct answers, b. exactly 5 correct

  4. Math Help plz

    A multiple choice test has 5 questions each with 5 possible answers. Find the probability of answering all the questions correctly. A. 1/3,125 B. 1/25 C. 1/625 D. 1/125 How do you do this problem?

You can view more similar questions or ask a new question.