SATHEE: Probability 5 Question 9

Probability 5 Question 9

9. A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just by guessing is (2013 Main)

(a) $\frac{17}{3^{5}}$

(b) $\frac{13}{3^{5}}$

(d) $\frac{10}{3^{5}}$

Show Answer

Answer:

Correct Answer: 9. (c)

Solution:

Probability of guessing a correct answer, $p = \frac{1}{3}$ and probability of guessing a wrong answer, $q = 2 / 3$

$∴$ The probability of guessing a 4 or more correct answers $=^{5} C_{4} \frac{1}{3} \cdot \frac{2}{3} +^{5} C_{5} \frac{1}{3}^{5} = 5 \cdot \frac{2}{3^{5}} + \frac{1}{3^{5}} = \frac{11}{3^{5}}$

पिछला

अगला

Probability 5 Question 9

9. A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just by guessing is (2013 Main)

Answer:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

Probability 5 Question 9

9. A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just by guessing is (2013 Main)

Answer:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

Menu