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September 2, 2014

Search: An unprepared student makes random guesses for ten true false questions. Find the probability tht the answers are either all correct or all wrong

Number of results: 113,274

math
An unprepared student makes random guesses for the ten true or false questions on a quiz.find the probablity that there is at least one correct answer.
October 27, 2009 by rency

PROBABILITY MATH
An unprepared student makes random guesses for the ten true-false questions on a quiz. Find the probability that there is at least one correct answer. Could some one please help me? And explain to me how they got the answer? and is there another way besides the tree method?
November 9, 2011 by HM

Math
On a true-false test, each question has exactly one correct answer: true, or false. A student knows the correct answer to 70% of the questions on the test. Each of the remaining answers she guesses at random, independently of all other answers. After the test has been graded, ...
April 29, 2013 by Snehan

Probability/Statistics
A quiz consists of 10 multiple-choice questions, each with 4 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 70 %. I'm not sure what to do. I figured that there's 10 questions, each ...
July 11, 2009 by Amy

statistics
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?
March 22, 2012 by Kathy

Finite Math
A quiz consists of 10 multiple-choice questions, each with 5 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 40 %
May 23, 2011 by Anonymous

Statistics
Please help. Find the probability of getting 2 hearts if the cards are drawn from a regular deck and the first card is not replaced. A true/false quiz consists of twenty questions. If a student answers the twenty questions by making random guesses, what is the probability of ...
December 11, 2006 by Mary

Probability
Darby guesses the answers to six questions on the math portion of her college entrance exam. Each question is a true or false question. What is the approximate probability that at least 4 of her answers are correct? A. 0.23 B. 0.34 C. 0.66 D. 0.78
March 4, 2012 by Student

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?
March 7, 2014 by Anonymous

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 the rest incorrectly? (b)What is the ...
April 7, 2010 by Kim

math (stats)
A biology professor gives a surprise quiz consist of a true/false question followed by a multiple choice question with four possible answers. If both questions are answered with random guesses, find the probability that both responses are correct. Please show your work.
January 23, 2012 by juan777

Probability
Darby guesses the answers to six questions on the math portion of her college entrance exam. Each question is a true or false question. What is the approximate probability that at least 4 of her answers are correct? A. 0.23 B. 0.34 C. 0.66 D. 0.78 Explanation please??
March 4, 2012 by Student

statistics
a quiz consists of 30 true or false questions. if the student guesses on each question, what is the standard deviation of the number of correct answers
April 29, 2013 by mike

probability and statistics
a multiple choice test onsists 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 answers, c. at most 4 correct answers, d. at most ...
March 12, 2014 by marie

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 answers, c. at most 4 correct answers, d. at most...
March 12, 2014 by marie

Maths
A true/ false test is given. If a person guesses the answers, the probability that any particular question is correctly answered is 0.5. If the test contains 14 questions and 7 correct answers is a pass, what is the probability of passing the test by simply guessing?
February 13, 2014 by Lucy

statistics
a test consists of true/false questions .to pass the test a student must answer at least 6questions correctly .if a student guesses on each question,what is the probability that the student will pass the test
December 5, 2009 by AILY

Probability
Thank you for the explanation MathMate! Would the answer to this question be A? Darby guesses the answers to six questions on the math portion of her college entrance exam. Each question is a true or false question. What is the approximate probability that at least 4 of her ...
March 4, 2012 by Student

math
In an examination a candidate is given the four answers to four questions but is not told which answer applies to which question. He is asked to write down each of the four answers next to its appropriate question. b). show that there are 6 ways of getting just two answers in ...
June 30, 2014 by Heidi

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 alternatives are equally likely for each question on ...
May 14, 2008 by Christine

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?
August 14, 2013 by Lisa Matthews

Math (statistics)
In an examination a candidate is given the four answers to four questions but is not told which answer applies to which question. He is asked to write down each of the four answers next to its appropriate question. b). show that there are 6 ways of getting just two answers in ...
July 8, 2014 by Heidi

Statistics
A 50-question true-false exam is given. Each correct answer is worth 10 points. Consider an unprepared student who randomly guesses on each question. In your solution, please be sure to show the exact steps you used to arrive at the answers. A. If 5 points are deducted for ...
October 10, 2012 by Jake

Statistics
A true-false test consists of 20 questions, each of which has one correct answer: true, or false. One point is awarded for every correct answer, but one point is taken off for each wrong answer. Suppose a student answers every question by guessing at random, independently of ...
May 6, 2013 by AmmanJordan

Stats
An instructor gives a test with 20 multiple choice questions. There are 4 responses per questions and only one choice correct. The test also has 30 True/False questions. Determine the probability a student randomly guessing on all questions and correctly answering no more than...
March 31, 2011 by Lacey

Math
Darby guesses the answers to six questions on the math portion of her college entrance exam. Each question is a true or false question. What is the approximate probability that at least 4 of her answers are correct? A. 0.23 B. 0.34 C. 0.66 D. 0.78 Is it B?
March 3, 2012 by Student

Math
Darby guesses the answers to six questions on the math portion of her college entrance exam. Each question is a true or false question. What is the approximate probability that at least 4 of her answers are correct? A. 0.23 B. 0.34 C. 0.66 D. 0.78
March 4, 2012 by Anonymous

PROBABILITY MATH
Find the probability of correctly answering the first 4 questions on a multiple choice test if random guesses are made and each question has 5 possible answers. Explain to me the answer?
November 9, 2011 by HM

stat probability
A multiple choice quiz consists of 20 questions, each with 3 possible equally likely answers. If a student guesses at the answer to each question, then the mean number of correct answers selected by the student is?
April 8, 2013 by Lynn

maths
Suppose a student guesses the answer to a true or false Question on a test by tossing a coin: if the coin lands Heads, she answers True, and if it lands Tails, she answers False. What is the chance that she gets the right answer?
April 27, 2013 by anonymous

Math/Prob
Claire takes a five-question true-false test. She hasn't studied, so she guesses at random. With her ESP she figures she has a 60% probability of getting any one answer wrong. A. What is the probability of getting an answer wrong? (Do you think they want me to ignore the ESP ...
May 23, 2012 by Ben

Statistics
A multiple choice test consists of 60 questions. Each question has 4 possible answers of which one is correct. If all answers are random guesses, estimate the probability of getting at least 20% correct? Trouble with deciding p, n, q, and P (X)
October 8, 2010 by Lori

stats
a student randomly guesses at five multiple-choice questions, each question has five possible choices (suppose the choice for each question is independent): a) Find the probability that the student gets exactly three correct. b) What is the probability that the student gets ...
March 31, 2012 by jeanette

Math
A student guesses on every ??? of a multiple choice test that has 9 quetions, each with 3 possible answers. what's the probability the student will get at least 7 of the questions right?
February 10, 2010 by Reta

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? less than 7 are correct?
November 16, 2012 by anonymous

statistic
Quiz has 6 questions. Each question has five possible answers, only one of each 5 answers is correct. If student randomly guesses on all six questions, what is the probability to answer 2 questions right? Tip: first, you have to define parameters of Binomial distribution: n - ...
December 4, 2010 by tanya

Probability
Please help.. Find the probability of getting 2 hearts if the cards are drawn from a regular deck and the first card is not replaced. A true/false quiz consists of twenty questions. If a student answers the twenty questions by making random guesses, what is the probability of ...
December 10, 2006 by Mary

Stats
A test has 15 true or false questions and 10 multiple choice questions (each with 4 choices). All questions are weighted equally. Jack has not studied at all for the test and randomly guesses. 1. What is the probability that Jack gets 96% on the test? a. 0.000000001 b. 0....
October 23, 2010 by Rhea

math
I have no idea where to start! *A quick quiz consists of 3 multiple choice problems, each of which has 4 answers, only one of which is correct. If you make random guesses on all 3 problems, (a) What is the probability that all 3 of your answers are incorrect? (b) What is the ...
August 16, 2009 by Emily

Statistics
There are 100 questions from a SAT test, and they are all multiple choice with possible answers of a,b,c,d,e for each question only one answer is correct. Find the mean number of correct answers for those who make random guesses for all 100 questions?
February 13, 2014 by Karen

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.
August 8, 2009 by Twg

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 test. What is the probability that the ...
November 28, 2010 by Joseph

Elementary Statistics
There are 100 questions from an SAT test, and they are all multiple choice with possible answers of a,b,c,d,e. For each question, only one answer is correct, find the standard deviation for the numbers of correct answers for those who make random guesses for all 100 questions.
April 11, 2014 by Confused

statistics
A multiple choice exam has 20 questions; there are four choices for each question. A student guesses the answer to every question. Find the chance that he guesses correctly between four and seven times. Find the minimum score the instructor can set so that the probability that...
February 10, 2014 by m

Math
13. A true or false test has 8 questions. What is the probability of guessing the correct answers to all the questions? A. 1/10 B. 1/16 C. 1/64 D. 1/256
April 17, 2014 by Chris

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.
August 9, 2009 by Twg

English
1.) Anyone can publish information on the Internet without fact-checking it. A.) True************************ B.) False 2.) Public records are most likely to contain valid information than secondhand reports. A.) True******************************** B.) False 3.) The ...
April 19, 2014 by Cassie

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 is the probability of getting less than 9 ...
March 23, 2010 by please help me!

Mathematics
A professor gives a test with 100 true-false questions. If 60 or more are necessary to pass, what is the probability that a student will pass by random guessing?
October 2, 2007 by Jen

Finite Math
A biology quiz consists of 10 multiple -choice questions. 7 must be answered correctly to receive a passing grade. If each question has 4 possible answers, of which only one is correct, what is the probability that a student who guesses at random on each question will pass the...
October 8, 2012 by Toni

Stats
A student takes a 32 question multiple choice exam but did not study and randomly guesses each answer. Each question has three possible choices for the answer. Find the probability that the student guesses more than 75% of the questions correctly. (Round your answer to three ...
November 1, 2012 by Madmistro

Stat
A student takes a 10-question true-false and randomly guesses the answer to each question. Suppose a correct answer is worth 1 point, an incorrect answer is worth -.5 points. Find the probability the student gets 7 or more points.
May 4, 2013 by alice

Binomial Distribution
A biology quiz consists of twelve multiple-choice questions. Eight must be answered correctly to receive a passing grade. If each question has five possible answers, of which only one is correct, what is the probability that a student who guesses at random on each question ...
April 18, 2012 by Price

math-Probablity
A student is writing a multiple choice test consisting of 40 questions, each of which provides four possible choices. He is certain that he has 16 questions correct. If he guesses for all of the remaining 24 questions, what is the probability that he will pass the test?
June 5, 2012 by demi

LBCC
A multiple choice quiz consists of 20 questions, each with 3 possible equally likely answers. If a student guesses at the answer to each question, then the mean number of correct answers selected by the student is?
April 7, 2013 by Lynn

Chemistry
Match each of the questions below with either "True" or "False" as appropriate. -The metals with the highest ionization energies are most likely to be found in nature in the elemental state. - Metals usually have higher melting points than nonmetals. - Co(II) ion in water is ...
April 20, 2007 by Lisa

Basic economic True or False questions?
UGHHHHH I CANNOT FIND THESE ANSWERS ANYWHERE DD; 1. On an economic supply and demand graph, consumer surplus is always located above the demand curve. True or false? 2. Wealth is destroyed when socially optimal products are created. True or false? 3. A symmetrical market ...
July 23, 2009 by Ruth Li

Probability (Pre-Calculus)
A class is given a list of eight study problems from which five will be part of an upcoming exam. If a given student knows how to solve six of these problems, find the probability that the student will be able to answer: (a) all five questions on the exam. (b) exactly eight ...
March 25, 2010 by Hailey

Math Binomial theorem
I'm preparing for a test and one of the questions in my text is as follows: In a trivia contest,Sam has drawn a topic he knows nothing about, so he makes random guesses for the 10 T/F questions. Use the binomial theorem to help find a)the number of ways Sam can answer the test...
April 17, 2011 by ann

Stats
Richard has just been given a 4-question multiple-choice quiz in his history class. Each question has five answers, of which only one is correct. Since Richard has not attended class recently, he doesn't know any of the answers. Assuming that Richard guesses on all four ...
October 3, 2012 by Collie

Math (check answer plz)
13. A true-false test has 12 questions. What is the probability of guessing the correct answers to all of the questions? (1 point) A: 1 over 4096*******? B: 1 over 144 C: 1 over 24 D: 1 over 14
June 11, 2014 by Me

Statistics
On a very short quiz, there is one multiple choice question with 5 possible choices (a, b, c, d, e) and one true or false question. Assume you are taking the quiz but do not have any idea what the correct answer is to either question. You mark an answer to each question anyway...
July 8, 2011 by Cassie

math
Mrs. Sue please help! A true-false test has 12 questions. What is the probability of guessing the correct answers to all of the questions? (1 point) 1 over 4096 1 over 144 one over twenty four 1over14
May 26, 2014 by Austin

Data Management
In a multiple choice test that contains ten questions with each question having five possible answers, what is the probability that Colin will pass the test if he merely guesses at each question?
May 22, 2014 by Scott

Math
On a nine-question true-or-false test you randomly guess at the answers. What is the probability that you get all nine answers correct? What is the probability that you get all nine answers wrong?
June 4, 2012 by Stryke

mATH ANSWERS
1) If the odds in favor of an event A are 3 to 1, what is the probability associated with event A occurring? A) B) C) 4 D) Determine whether the situation calls for a discrete or continuous random variable. 2) The height of a randomly selected student. A) Discrete B) ...
June 10, 2011 by KEL

maths
multiple choice question has 5 available options, only 1 of which is correct. Students are allowed 2 attempts at the answer. A student who does not know the answer decides to guess at random, as follows: On the first attempt, he guesses at random among the 5 options. If his ...
April 29, 2013 by Anonymous

History
The Magna Carta laid the foundation for a written social contract between the government and the people. True* False It protected the rights and property of all those considered to be free men. True * False It limited the king's power to tax without the consent of his free ...
October 17, 2012 by Mya

7th grade health true or false
11. Disagreements are a normal part of life. (1 point) True False 12. Talking to a trustworthy adult is the best way to stop sexual abuse and get help. (1 point) True False 13. Some conflicts are made worse by peer negotiation. (1 point) True False 14. Feeling negatively about...
January 11, 2013 by Delilah

statistics
10. A student is taking a multiple choice test where each question have 5 possible answers of which only one is right. If the student knows the answer the student answers correctly, otherwise there is a 20% probability of correct answer. Assume the student knows 70% of the ...
September 12, 2012 by mutinda

statistics
A student is taking a multiple choice test where each question have 5 possible answers of which only one is right. If the student knows the answer the student answers correctly, otherwise there is a 20% probability of correct answer. Assume the student knows 70% of the ...
September 12, 2012 by erick

Probability
For each of the following statements, determine whether it is true (meaning, always true) or false (meaning, not always true). Here, we assume all random variables are discrete, and that all expectations are well-defined and finite. Let X and Y be two binomial random variables...
March 4, 2014 by qwerty

statistics
Richard has been given a 5-question multiple-choice quiz in his history class. Each question has three answers, of which only one is correct. Since Richard has not attended the class recently, he doesn't know any of the answers. The success occurs if Richard answers a question...
November 9, 2010 by Anonymous

Physical Ed
11. Disagreements are a normal part of life. (1 point) True False 12. Talking to a trustworthy adult is the best way to stop sexual abuse and get help. (1 point) True False 13. Some conflicts are made worse by peer negotiation. (1 point) True False 14. Feeling negatively about...
February 6, 2013 by Someone

psychology statistics for behavioral sciences
A multiple-choice test has 48 questions, each with four response choices. If a student is simply guessing at the answers, a. What is the probability of guessing correctly for any question? b. On average, how many questions would a student get correct for the entire test? c. ...
March 20, 2013 by gina

PHI 103
Will someone please confirm my answers here. I'm stumped. Feel good, but not sure. Thank you. 1. "Julie and Kurt got married and had a baby" is best symbolized as M v B M & B M °ś B M °Í B My choice is C 2. What is the truth value of the sentence "P v ~ P"? True False Cannot ...
September 15, 2012 by charger

statistic
A multiple-choice test has 48 questions, each with four response choices. If a student is simply guessing at the answers, a. What is the probability of guessing correctly for any question? b. On average, how many questions would a student get correct for the entire test? c. ...
January 27, 2013 by Nickie

maths
To get an A grade on the test, you need a total score of more than 16 points. One of the students knows the correct answer to 6 of the 20 questions. The rest she guesses at random by tossing a coin (one toss per question,true if heads and false if tails). What is the chance ...
April 27, 2013 by anonymous

Math
Can someone please double check my answers (My answers are in Capital) 1. If you produce a million products a day and you want to test ten of them to determine if they are up to standard, which ones will you choose? a. The second ten B. TEN RANDOM UNITS c. The last ten d. The ...
June 18, 2013 by mysterychicken

math
a true or false test has 5 questions. what is the probability of guessing exactly four out of the five answers correstly.
November 6, 2009 by Katherine

Statistics
Richard has been given a 5-question multiple-choice quiz in his history class. Each question has four answers, of which only one is correct. Since Richard has not attended the class recently, he does not know any of the answers. The success occurs if Richard answers a question...
June 15, 2010 by Jacob

math
A multiple-choice test has 10 questions. Each question has 5 choices. If a student answers each question by guessing randomly, find the probability that the student gets: a) at most 4 questions correct b) at least 7 questions correct Please show your work.
May 23, 2011 by corey

AXIA UOP
ANY OF THIS LOOK FAMILIAR? Compare and contrast your participantís answers with your own, and write a 350- to 500-word summary that answers all of the following questions: How are your table answers similar? How are they different? Do either tables list descriptors in the Both...
September 2, 2007 by phkurt

HEALTH HELP PLEASE!!
Fats help maintain your cell membranes. (1 point) True False 12. Your body does not use energy when you sleep. (1 point) True False 13. People with anorexia nervosa eat large amounts of food and then purge. (1 point) True False 14. Your body image is the way others see your ...
December 5, 2012 by Jess

grammar
Can you plese tell if the follong questions are true or false (fragment) 1. That movie, one of my favorites, true or false? 2.-The local baseball team, needing a good picher true or false? 4.- Using a flashlight, he looked under the bed for his shoes true or false, thank you
May 8, 2010 by Stephanie

7th grade health Ms. Sue please thanks
True/False Indicate whether the statement is true or false. 11. A person with good self-esteem is willing to try new things. (1 point) True False 12. Stress can be positive or negative. (1 point) True False 13. Giving away prized possessions can be a sign of a person ...
December 12, 2012 by Delilah

Statistics
If someone makes random guesses for each NCAA Basketball Tournament game, what is the probability of picking the winner in each game?
September 17, 2013 by Mary

math
Part A of your history test has 15 multiple choice questions. Each question has four choices. Part B has 10 true/false questions. How many ways are there to answer the 15 multiple choice questions? How many ways are there to answer the 10 true or questions? How many are there ...
February 15, 2011 by John

statistic****help*****
Show all your work. Indicate clearly the methods you use because you will be graded on the correctness of your methods as well as on the accuracy of your results and explanation. A simple random sample of adults living in a suburb of a large city was selected. The age and ...
March 19, 2014 by akiba

chemistry
In the chemical plating experiment zinc powder is dissolved in a hot NaOH solution to form sodium zincate according to the following reacton: Zn(s) + 2NaOH(aq) Na2ZnO2(aq) + H2(g) Answer true or false for each of the following statements regarding the reaction above. Zn(s) is...
May 2, 2010 by chem help

STATISTIC***HELP
Show all your work. Indicate clearly the methods you use because you will be graded on the correctness of your methods as well as on the accuracy of your results and explanation. A simple random sample of adults living in a suburb of a large city was selected. The age and ...
March 18, 2014 by KIBA

stats
a test consists of 25 multiple choice questions. Each has 5 possible answers, which only one is correct. If a student guesses on each question, find the following: a) prob that he will guess all of them right b)prob that he will guess at most 12 right c) prob that he will ...
February 18, 2011 by gio

Chemistry: Answers please check
1. The kinetic-molecular theory states that all particles of matter are always in motion. a.) True b.) False Answer: True 2. Gases have molecules in rapid random motion. a.) T
April 2, 2011 by Cheryl

statistics
Rework problem 15 from section 3.5 of your text involving a true-false test. Assume that 20 questions are answered by guessing. What is the probability of exactly 15 correct answers?
October 13, 2010 by Anonymous

statistics
The mean scale score on the mathematics examinatin of ninth graders in Texas was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probability tht his score was 91 or higher
February 10, 2013 by kelly

statistics
The mean scale score on the mathematics examinatin of ninth graders in Texas was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probability tht his score was 91 or higher
February 10, 2013 by kelly

statistics
The mean scale score on the mathematics examinatin of ninth graders in Texas was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probability tht his score was 91 or higher
February 10, 2013 by kelly

Algebra
A test consist of 15 multiple choice questions, 12 true-false questions and 10 fill in the bland questions. you got 8 questions wrong. what percent of the answers were correct?
May 8, 2013 by Kevin

Physics Please check my answers
It's possible for a body to have both rotational and translational motion at the same time. True. << False. 2. The moment of inertia of an object would be different on the surface of the earth than on the surface of the moon. True. << False. 3. The moment of ...
February 3, 2014 by Chelsea

Math, help
I need help what formula would i use or what steps do i take? A professor gives a test with 100 true-false questions. If 60 or more correct is necessary to pass, what is the probability that a student will pass by random guessing? The brute force way of doing this is add up ...
July 13, 2007 by student

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