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in Probability and Probability Distribution by (46.2k points)

In a 20 questions true-false examination are asked. Suppose a student tosses a fair coin to determine his answer to each question. If the coin falls heads, his answer ‘true’ If it falls tails, his answer ‘false’. Find the probability that his answer at least 12 questions correctly.

1 Answer

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Best answer

P (Getting head on toss) P = 1/2

P (not getting head on toss) 

q = 1 – person 

= 1 – 1/2 = 1/2

∴ Probability of writing correct answer = 1/2

and probability of writing incorrect answer = 1/2

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