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What is the probability in decimals of a student getting at least one answer correct out of ten true or false questions?
0.05 I think is the answer
A test consist of 10 true or false questions 2 pass the test the student must answer atleast 8 correctly if the student guesses on each question what is the probability that the student will pass?
The probability that the student will pass is; P(pass) = P(10) + P(9) + P(8) = [10C10 + 10C9 + 10C8] / (.5)10 = 56/1024 ~ ~ 0.0547 ~ 5.47% where nCr = n!/[r!(n-r)!]
What are the two major reasons why psychology researchers do not involve probability sample?
Psychology researches do use probability samples, so the question is based on false premises.
If On a true and false test what is the probability of answering a question correctly if you make a random guess?
50:50
In a twenty question true false examination a student must achieve eight correct answers to pass if student answers randomly what is the probability that student will fail?
The probability this student will fail is the same as the probability that some other student will flip a fair coin 20 times and get less than 8 heads, i.e., more than 12 tails. There are 2^20 possible different-looking sequences of 20 coinflips, which we assume all have equal probability. Of those sequences, 1 has no heads at all, 20 have exactly 1 head, 190 have exactly 2 heads, ... and 77520 have exactly 7 heads. So we sum up all those possible ways to fail and we get ... ... ... I'm assuming that the student answers randomly, flipping a fair (50:50) coin on each question to choose "true" or "false". In that special case, it doesn't matter how many of those twenty questions are true or how many are false. (If the student answers randomly by flipping an unfair coin, say a 25:75 coin, then it does matter how many of those questions are true -- I'll let you figure that one out).
A student takes a 10 question true or false exam and guesses on each question Find the probability of passing if the lowest passing grade is 6 correct out of 10?
5 out of 10
What is the probability of guessing the correct answer to a true or false question?
50%
A test consists of 10 true or false questions to pass the test the student must answer atleast 8 correctly if the student guesses on each question what is the probability that the student will pass?
7/128, or about 5.5% The student has a 1/2 probability of getting each question correct. The probability that he passes is the probability that he gets 10 correct+probability that he gets 9 correct+probability that he gets 8 correct: P(passes)=P(10 right)+P(9 right)+P(8 right)=[(1/2)^10]+[(1/2)^10]*10+[(1/2)^10]*Combinations(10,2)=[(1/2)^10](1+10+45)=56/1024=7/128.
What is the probability in decimals of a student getting at least one answer correct out of ten true or false questions?
0.05 I think is the answer
A test consist of 10 true or false questions 2 pass the test the student must answer atleast 8 correctly if the student guesses on each question what is the probability that the student will pass?
The probability that the student will pass is; P(pass) = P(10) + P(9) + P(8) = [10C10 + 10C9 + 10C8] / (.5)10 = 56/1024 ~ ~ 0.0547 ~ 5.47% where nCr = n!/[r!(n-r)!]
To pass a true or false test a student must answer 8 out of 10 correct. What is the probability a student will pass if he quesses on all 10 questions?
Total number of different ways he can fill out the answer sheet = 210 = 1,024 .He passes the test if he gets zero wrong, one wrong, or two wrong.Number of ways to get zero wrong = 1.Number of ways to get exactly one wrong = 10.Number of ways to get exactly two wrong = 45.Total number of ways to get exactly 0, 1, or 2 wrong = (1 + 10 + 45) = 56.Probability of passing = (56) / (1,024) = 5.47%(rounded)
On an eight question true false quiz a student guesses each answer What is the probability that he gets at least One of the answers correct?
The probability of getting at least 1 answer correct = 1 - Probability of getting all answers correct.So in your case it for be P(at least 1 answer correct) = 1 - 1/256where 256 is your sample space, |S| = 2^8.
What are the two major reasons why psychology researchers do not involve probability sample?
Psychology researches do use probability samples, so the question is based on false premises.
If On a true and false test what is the probability of answering a question correctly if you make a random guess?
50:50
Probability of getting a perfect score in a three question true or false quiz?
If you answer randomly, 1 in 8.
In a twenty question true false examination a student must achieve eight correct answers to pass if student answers randomly what is the probability that student will fail?
The probability this student will fail is the same as the probability that some other student will flip a fair coin 20 times and get less than 8 heads, i.e., more than 12 tails. There are 2^20 possible different-looking sequences of 20 coinflips, which we assume all have equal probability. Of those sequences, 1 has no heads at all, 20 have exactly 1 head, 190 have exactly 2 heads, ... and 77520 have exactly 7 heads. So we sum up all those possible ways to fail and we get ... ... ... I'm assuming that the student answers randomly, flipping a fair (50:50) coin on each question to choose "true" or "false". In that special case, it doesn't matter how many of those twenty questions are true or how many are false. (If the student answers randomly by flipping an unfair coin, say a 25:75 coin, then it does matter how many of those questions are true -- I'll let you figure that one out).
What is the probability of getting a question right simple by guessing?
That depends a lot on the specific circumstances, of how you guess. For instance, if a test has true/false questions, the probability is 1/2; if it is a multiple-choice question with 4 options, the probability is 1/4; if there are 6 options, the probability is 1/6, etc.; if you have to calculate a number (and it is NOT a multiple choice question), the probability is rather low, indeed.
