There are 5 multiple choice questions with 4 posiible answers each out of which only one is correct.What is the probability of getting atleast 3 answers correct?
Answers
Answered by
1
Total no of questions=5
Possible answers=20 (5×4)
Total correct answers=5 (as there is only one ans correct in each ques)
So the probability of getting at least 3 ans correct will be= 3/20
: )
sami99:
Yes....which is better.....although both r the exact same....
its wrong....sry
How is it wrong ?can u pls give the correct ans....
i too dont knw! :(
Here is the answer.....5c3*(1/4)^3 * (3/4)^2 + 5c4*(1/4)^4 * (3/4) +5c5 *(1/4)^5 =53/512...........
Answered by
1
No. of MCQ questions = 5
No. of correct answer in 1 MCQ question = 1 out of 4 options
No. of possible answers total = 5 * 4 = 20
No. of total correct answers = 5/20
Probability of getting 3 answers correct is 3/20
No. of correct answer in 1 MCQ question = 1 out of 4 options
No. of possible answers total = 5 * 4 = 20
No. of total correct answers = 5/20
Probability of getting 3 answers correct is 3/20
if u find it useful please mark as best
no.......wrng answer
how?
its a question asked in interview! i remember only the denominator values...its like 512 for 3 options and 256 for a single option
Here is the answer.....5c3*(1/4)^3 * (3/4)^2 + 5c4*(1/4)^4 * (3/4) +5c5 *(1/4)^5 =53/512
Similar questions