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The probability that a teacher will give an unannounced test during any class is 1/5. If a student
is absent twice ,then probability that misses atleast one test is ?
Solution
Given the probability of teacher will give an unannounced test during any class is 1/5.
The probability of not missing test 1-1/5=4/5
probability of missing test in only one day 2(4/25)=8/25
probability of missing test on both the day (1/5)*(1/5)=1/25
probability that misses atleast one test is (8/25)+(1/25)=9/25
probability that misses atleast one test is 9/25

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The probability that a teacher will give an unannounced test duri.pdf

  • 1. The probability that a teacher will give an unannounced test during any class is 1/5. If a student is absent twice ,then probability that misses atleast one test is ? Solution Given the probability of teacher will give an unannounced test during any class is 1/5. The probability of not missing test 1-1/5=4/5 probability of missing test in only one day 2(4/25)=8/25 probability of missing test on both the day (1/5)*(1/5)=1/25 probability that misses atleast one test is (8/25)+(1/25)=9/25 probability that misses atleast one test is 9/25