1 votes 1 votes 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 at least one test is (a) 24/25 (b) 16/25 (c) 7/25 (d) 9/25 Probability engineering-mathematics isro-mech probability + – sh!va asked Mar 7, 2017 • retagged Mar 8, 2019 by Naveen Kumar 3 sh!va 687 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 1 votes 1 votes The student is absent on two consecutive days. The probability NO two consecutive surprised test = $\begin{align*} &\frac{4}{5}*\frac{4}{5} = \frac{16}{25} \\ \end{align*}$ The probability that the student does not miss these two test = $\begin{align*} \frac{16}{25} \\ \end{align*}$ The probability that the student misses at least $1$ test = $\begin{align*} 1- \frac{16}{25} = \frac{9}{25} \\ \end{align*}$ dd answered Mar 7, 2017 • selected Mar 9, 2019 by dd dd comment Share Follow See all 0 reply Please log in or register to add a comment.