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On a multiple choice examination with three possible answers ( out of which only one is correct ) for each of the five questions, what is the probability that the candidate would get four or more correct answers just by guessing?
cbse
class12
modelpaper
2009
sec-b
q16
math
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asked
Dec 21, 2012
by
thanvigandhi_1
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0
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1
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On a multiple choice examination with three possible answers for each of the five questions, what is the probability that a candidate would get four or more correct answers just by guessing ?
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In an entrance examination a student has to answer all the $120$ questions. Each question has four options and only one option is correct. A student gets $1$ mark for a correct answer and loses half mark for a wrong answer. What is the expectation of the mark scored by a student if he chooses the answer to each question at random?
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In an examination, 10 questions of true-false type are asked. A student toses a fair coin to determine his answer to each question. If the coin falls heads, he answers 'true' and if it falls tails, he answers 'false'. Show that the probability that he answers at most 7 questions correctly is \( \frac{121}{128} \).
asked
Feb 3, 2013
by
thanvigandhi_1
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The probability of guessing correctly atleast 8 out of 10 answers on a true - false examination is :
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Jan 6, 2014
by
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The probability of guessing correctly at least 8 out of 10 answers on a true-false type examination is
asked
Jan 10, 2013
by
sreemathi.v
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True-or-False:A candidate is required to answer 7 questions out of 12 questions which are divided into two groups,each containing 6 questions. He is not permitted to attempt more than 5 questions from either group. He can choose the seven questions in 650 ways.
asked
May 16, 2014
by
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0
votes
1
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In answering a question on a multiple choice test, a student either knows the answer or guesses. Let \( \frac{3}{4} \) be the probability that he knows the answer and \( \frac{1}{4} \) be the probability that he guesses. Assuming that a student who guesses at the answer will be correct with probability \( \frac{1}{4} \) . What is the probability that the student knows the answer given that he answered it correctly?
asked
Nov 27, 2012
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