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    				| 1. | Each of the total fice questions in amultiple choice examination has four choices, only one of which is correct.A student is attempting to guess the amswer . The renadom varible X is the number of question answerred correctly. What is the probability that the student will giveat least one correct answer ? | 
| Answer» Let p = probability that the given answer is correct. Q= probability that the given answer is wrong. `p=(1)/(4),q=1-(1)/(4)=(3)/(4)` P Probability that the student will given wrong answers of all questions. `=(3)/(4)xx(3)/(4)xx(3)/(4)xx(3)/(4)xx(3)/(4)` `=(243)/(1024)` Probability that the student will given at least one correct answer `=1-(243)/(1024)` | |