{"id":6965,"date":"2021-10-22T02:20:10","date_gmt":"2021-10-21T20:50:10","guid":{"rendered":"https:\/\/mathemerize.com\/?p=6965"},"modified":"2021-10-25T01:58:17","modified_gmt":"2021-10-24T20:28:17","slug":"a-multiple-choice-examination-has-5-questions-each-question-has-three-alternative-answers-of-which-exactly-one-is-correct-the-probability-that-a-student-will-get-4-or-more-correct-answers-just-by-gu","status":"publish","type":"post","link":"https:\/\/mathemerize.com\/a-multiple-choice-examination-has-5-questions-each-question-has-three-alternative-answers-of-which-exactly-one-is-correct-the-probability-that-a-student-will-get-4-or-more-correct-answers-just-by-gu\/","title":{"rendered":"A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just by guessing is"},"content":{"rendered":"
Probability of guessing a correct answer, p = \\(1\\over 3\\)<\/p>\n
and probability of guessing a wrong answer, q\u00a0 = \\(2\\over 3\\)<\/p>\n
So, the probability of guessing 4 or more correct answers is<\/p>\n
= \\(^5C_4\\) \\(({1\\over 3})^4\\). \\(2\\over 3\\) + \\(^5C_5\\) \\(({1\\over 3})^5\\)<\/p>\n
= \\(5.2\\over {3^5}\\) + \\(1\\over {3^5}\\) = \\(11\\over {3^5}\\)<\/p>\n
The probability of India winning a test match against the west indies is 1\/2 assuming independence from match to match. The probability that in a match series India\u2019s second win occurs at the third test is<\/a><\/p>\n If C and D are two events such that C \\(\\subset\\) D and P(D) \\(\\ne\\) 0, then the correct statement among the following is<\/a><\/p>\n A pair of fair dice is thrown independently three times. The probability of getting a score of exactly 9 twice is<\/a><\/p>\n A and B play a game, where each is asked to select a number from 1 to 25. If the two numbers match, both of them win a prize. The probability that they will not win a prize in a single trial is<\/a><\/p>\n