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How do you find the probability of guessing exactly three four choice multiple choice questions out of five?
The probability of guessing any one is 1 out of 4, or 0.25.
Assume that the choices are made independently. Then, if X is the random variable which represents the number of successes (correct guesses), X is a Binomial variable with n = 5 and p = 0.25.
Then Prob(X = 3) = 5C3*p^3*(1-p)^(n-3)
= 10*(0.25)^3*(0.75)^2
= 0.088, approx.
What else can I help you with?
Georgia is taking a 5 question multiple choice quiz in which each question has 4 choices She guesses on all questions What is the probability that she answers exactly 2 of the questions correctly?
64/256
A test has 5 multiple choice questions each with 4 choices what is the probability of guessing exactly 3 out of 5 right?
Since there are 4 choices the probability of guessing any given answer correctly is 1/4 or .25; call this a success and denote it by p The chance of guessing wrong is .75; call this a failure and denote it by q. So the chance of 3 out of 5 correct answers is 5C3xp^3q^(5-3)=10p^3q^2 5C3x(.25)^3(.75)^2 5x4x3/3x2(.15625)(.5625) 10(.12625)(.5625)=.0877891
What is experimental probability of correctly guessing at exactly zero correct answers?
I regret that I do not have access to a study that looked at this matter and so do not have any experimental evidence.
If 3 fair coins are tossed what is the probability of getting exactly 2 tails?
The probability is 3/8 = 0.375
Three dice are tossed what is the probability that the same number appears on exactly two of the three dice?
The probability is 90/216 = 5/12
Georgia is taking a 5 question multiple choice quiz in which each question has 4 choices She guesses on all questions What is the probability that she answers exactly 2 of the questions correctly?
64/256
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 multiple choice test has 8 questions that has 3 possible answers only one is correct If Judy who forgot to study for the test guesses on all questions what is the probability that she gets 3 right?
The probability that she gets exactly 3 right is 8C3*(1/3)3*(2/3)5 = 0.2731 approx.
A test has 5 multiple choice questions each with 4 choices what is the probability of guessing exactly 3 out of 5 right?
Since there are 4 choices the probability of guessing any given answer correctly is 1/4 or .25; call this a success and denote it by p The chance of guessing wrong is .75; call this a failure and denote it by q. So the chance of 3 out of 5 correct answers is 5C3xp^3q^(5-3)=10p^3q^2 5C3x(.25)^3(.75)^2 5x4x3/3x2(.15625)(.5625) 10(.12625)(.5625)=.0877891
What is experimental probability of correctly guessing at exactly zero correct answers?
I regret that I do not have access to a study that looked at this matter and so do not have any experimental evidence.
What is the probability that the 6 child family has exactly two girls?
The probability is 2 - 6
What is the probability of getting exactly 2 heads by flipping 3 coins?
The probability is 0.375
What is the probability of tossing exactly 3 tails?
.125
If 3 fair coins are tossed what is the probability of getting exactly 2 tails?
The probability is 3/8 = 0.375
A student takes a six question multiple choice quiz with 4 choices for each question What is the probability that the student will answer exactly 4 correctly?
P = (6!)/(6-4)!4!=15
Similarities between experimental and experimental probability?
They are exactly the same
What an event is certain to occur what us its probability?
Exactly 1.
