The probability that a teacher will give an u | vedclass

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(D) Let $P(T)$ be the probability of a test occurring in a class,where $P(T) = 1/5$. The probability of no test is $P(T') = 1 - 1/5 = 4/5$.The student

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$9/25$

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(D) Let $P(T)$ be the probability of a test occurring in a class,where $P(T) = 1/5$. The probability of no test is $P(T') = 1 - 1/5 = 4/5$.The student is absent for $2$ classes. Let $T_1$ and $T_2$ be the events that a test occurs in the first and second class,respectively.The student misses at least one test if a test occurs in the first class,the second class,or both.This is equivalent to the complement of the event that no test occurs in either class.Probability of no test in both classes $P(	ext{No test}) = P(T_1') 	imes P(T_2') = (4/5) 	imes (4/5) = 16/25$.Probability of missing at least one test $= 1 - P(	ext{No test}) = 1 - 16/25 = 9/25$.

The probability that a teacher will give an unannounced test during any class meeting is $1/5$. If a student is absent twice,then the probability that the student will miss at least one test is

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