Math, asked by riyadhruv12, 20 hours ago

In an objective exam which has 3 answer options each for all the 20 questions, what is the probability that Samir answers 9 questions incorrectly?​

Answers

Answered by madhumani9
6

Answer:

Yes 18 is the answer bro

Step-by-step explanation:

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Answered by jassimahi8967
0

Answer:

\frac{11}{243}

Step-by-step explanation:

Probability of correct guess = p(c)=\frac{1}{3}

Probability of wrong guess = p(w)=\frac{2}{3}

Probability that 4 answers are guessed correctly = p(4)=^5C_{4} (\frac{1}{3} )^4  (\frac{2}{3} )

Probability that 5 answers are guessed correctly = p(5)=^5C_{5} (\frac{1}{3} )^5

Thus, that the student solves 4 or more questions correctly just by guessing = p(4)+p(5)=(\frac{10}{3} )^5+(\frac{1}{3} )^5=\frac{11}{243}

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