If the probability of a student writing the right answer to a question is 1-5- then the probability of the student writing a wrong answer is 4-5

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Standard VI

Mathematics

Complementary Event

If the probab...

Question

If the probability of a student writing the right answer to a question is $\frac{1}{5}$ , then the probability of the student writing a wrong answer is $\frac{4}{5}$ .

True

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False

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Solution

The correct option is B
False

The statement is false because the two outcomes given are not collectively exhaustive. A third outcome (not attempting the question) is also there.

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Similar questions

Q. The probability that a student knows the correct answer to a multiple choice question is 2/3. If the student does not know the answer, then the student guesses the answer. The probability of the gussed answer being correct is 1/4. Given that the student has answreed the question correctly, the conditional probability that the student knows the correct answer is

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Q. In answering a question on a multiple choice test, a student either knows the answer or guesses, Let

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be the
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be the probability that he guesses.
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In answering a question on a multiple choice test a student either knows the answer or guesses. Let 3/4 be the probability that he knows the answer and 1/4 be the probability that he guesses. Assuming that a student who guesses at the answer will be correct with probability 1/4 What is the probability that a student knows the answer given that the answered it correctly?

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If the probability of a student writing the right answer to a question is 15, then the probability of the student writing a wrong answer is 45.

The correct option is B False The statement is false because the two outcomes given are not collectively exhaustive. A third outcome (not attempting the question) is also there.

If the probability of a student writing the right answer to a question is $\frac{1}{5}$ , then the probability of the student writing a wrong answer is $\frac{4}{5}$ .

The correct option is B
False

The statement is false because the two outcomes given are not collectively exhaustive. A third outcome (not attempting the question) is also there.