Question

Suppose an exam contains 8 "True-False" Questions. By random guessing, what is the probability that you get at least 5 of them right?

Answer #1

If a student just guesses on a True/False questions, there is
50% to guess the answer correctly. Suppose a True/False question
exam contains 50 questions.
d) Find the approximate probability that a person who is just
guessing will fail the test (got lower than 60% correct
answers).
e) Find the approximate probability that a person who is just
guessing will get a 70% or better.

A section of an exam contains 6 True-False questions
A completed exam paper is selected at random, and the 6
True/False answers are recorded
a)List all outcomes in the sample space
b)Assuming the outcomes to be equally likely, find the
probability that all the answers are the same
c)Assuming the outcomes to be equally likely, find the
probability that exactly one of the 6 answers is True
d) Assuming the outcomes to be equally likely, find the
probability that at...

2.10 Guessing on an exam: In a multiple choice
exam, there are 7 questions and 4 choices for each question (a, b,
c, d). Nancy has not studied for the exam at all and decides to
randomly guess the answers. What is the probability that:
(please round all answers to four decimal places)
a) the first question she gets right is question number 3?
b) she gets all of the questions right?
c) she gets at least one question right?

A student takes an exam containing 11 true or false questions
if the student guesses what is the probability that he will get
less than six but more than three questions right

9. There are 50 true-or-false questions on an exam. For each
question there is only one correct answer. If you need to get at
least 65% of the questions correct to pass the test, what is the
probability of passing this test by making random guesses?
10. Referring to the previous problem, find the mean (expected
value) and variance for the number of questions you answer
correctly by making random guess.

A student takes an exam containing 13 true or false questions.
If the student guesses, what is the probability that he will get
exactly 2 questions right? Round your answer to four decimal
places.

A student takes an exam containing 15 true or false
questions. If the student guesses, what is the probability
that he will get exactly 4 questions right? Round
your answer to four decimal places.

16. Blind Guessing: Suppose that, on a 10-question quiz, you
need to get at least 7 correct to pass. Suppose also that, because
you have not studied any of the material, you can only blindly
guess the answers. Please answer the following questions: If all
ten questions are true/false, what is the probability of correctly
guessing 7 or more? If all ten questions are multiple choice, each
having four answers, what is the probability of correctly guessing
7 or more?

A student takes an exam containing 10 true or false questions.
If the student guesses, what is the probability that he will get
less than 6 but more than 3 questions right? Round your answer to
four decimal places.

A student is taking a true/false exam with 17 questions. If he
guesses on each question, what is the probability he will get at
least 14 questions correct?

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