0
If a student guesses on all 5 questions on a tru-false exam what is the probability that he or she get them all right?
Wiki User
∙ 9y ago
For each question the student has a 50% chance of answering right.
We can express this as a fraction of 1 (1 being 100%): 1/2, i.e. 0.5
There are 5 questions, so the answer will be:
0.5*0.5*0.5*0.5*0.5=0.5^5=0.03125
or 3.125%
Wiki User
∙ 9y ago
Add your answer:
Earn +20 pts
A test consists of 15 true false questions what is the probability if the student guesses on all 15 questions?
What is the probability of what?Guessing them all correctly?Getting half of the correct?Getting them all wrong?PLEASE be specific with your questions if you want WikiAnswers to help.
A student takes a 5 question quiz with 4 choices for each question if the student guesses at random on each question what is the probability that the student gets exactly 4 questions correct?
This is abinomial distribution; number of trials (n) is 5, probability of success (p) is 1/4 or 0.25. With this information you can go to a Binomial Distribution Table and find the solution. Within the section of values for n=5 and p=.25, read from the section the probability of 4 which is 0.0146 (see related link for table).
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
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.
If a student takes an 8 question true or false quiz and a student guesses each answer then what is the probability that heshe gets at least 1 correct?
The probability of getting at least 1 correct answer is equal to one minus theprobability of answering all incorrect, this would be;P(atleast 1 correct) =1 - P(allincorrect) =1 - (1/2)8 =1 - 0.00390625 ~~ 0.9961 ~ 99.61%
A test consists of 15 true false questions what is the probability if the student guesses on all 15 questions?
What is the probability of what?Guessing them all correctly?Getting half of the correct?Getting them all wrong?PLEASE be specific with your questions if you want WikiAnswers to help.
If a student guesses on all 5 questions on a tru-false exam what is the probability that he or she gets at least 3 answers correct?
2
What is the probability of getting exactly 7 out of 12 multiple choice questions right if a student randomly guesses one of the five possible choices for each question?
It is 0.0033
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)!]
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.
A student takes a 5 question quiz with 4 choices for each question if the student guesses at random on each question what is the probability that the student gets exactly 4 questions correct?
This is abinomial distribution; number of trials (n) is 5, probability of success (p) is 1/4 or 0.25. With this information you can go to a Binomial Distribution Table and find the solution. Within the section of values for n=5 and p=.25, read from the section the probability of 4 which is 0.0146 (see related link for table).
What is the probability a student can answer 49 out of 50 questions wrong on a four answer multiple choice exam?
Assuming the questions are answered at random, the probability is 0.000009, approx.
A multiple choice quiz consists of 6 questions each with 4 possible answers If a student guesses at the answer to each question then the mean number of correct answers is?
If there are four possible answers to a question, then a guessed answer would have a probability of 1 in 4. If there are six questions, then the mean number of correct answers would be six times 1 in 4, or 1.5
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
A test consists of 690 true or false questions If the student guesses on each question what is the mean number of correct answers?
Since there are only two options for the answer, on average the student will answer half of the answers correctly.
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
If a multiple choice quiz consists of 50 questions each with 5 possible choices find the mean for the number of correct answers if a student guesses on each question?
25
