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manyam soumith reddy
the probability that a teacher will give an unannounced test during any class meeting is 1/5. if a student is absent twice then ther probability that the student will miss at least one test is
May 5, 2016 at 3:42pm
Miss 2 lessons: So, Let 'YES' be the presence of unannounced test and 'NO' be the absence of unannounced test. Lesson 1 | Lesson 2 ----------------------------------- NO YES = (4/5)(1/5) = 4/25 YES NO = (1/5)(4/5) = 4/25 YES YES = (1/5)(1/5) = 1/25 By adding them all, probability of missing at least one test = 4/25 + 4/25 + 1/25 = 9/25
May 6, 2016 at 2:16am
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