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In an examination, 10 questions of true-...

In an examination, 10 questions of true-false type are asked. A student tosses a fair coin to determinehis answer to each question. If the coin falls heads, he answers "true" and if it falls Lails, he answers "false "Show that the probability that he answers at most correctly 7 questions is `121/128`.

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In an exam, 10 questions of true-false type are asked. A student tosses a fair coin to determine his answer to each question. If the coin falls heads, he answers true and if it falls tails, he answers false. Show that the probability that he answers at most 7 questions correctly is 121/128 .

In an examination,10questions of true-false type are asked.A student tosses a fair coin to determinehis answer to each question.If the coin falls heads,he answers true and if it falls Lails,he answers true and if it probability that he answers at most correctly 7 questions is (121)/(128) .

In an examination, 20 questions of true-false type are asked. Suppose a student tosses a fair coin to determine his answer to each question. If the com falls heads, he answers "true1; if it falls tails, he answers "false1. Find the probability that he answers at least 12 questions correctly.

In an examination, 20 questions of true-false type are asked. Suppose a student tosses a fair coin to determine his answer to each question. If the com falls heads, he answers true1; if it falls tails, he answers false1. Find the probability that he answers at least 12 questions correctly.

In an examination 20 questions of true false type are asked. Suppose a student tosses a fair coin to determine his answer to each question. If the coin falls head, he answers 'true', if it falls tail, he answers 'false'. Find the probability that he answers atlest 12 questions correctly.

In an examination 20 question of true false type are asked suppose a student tosses a fair coin to determine his answer to each question if the coins falls heads he answers true if it falls tail he answers false find the probability thet he answers at least 12 question correctly.

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

In an examination, 20 questions of true-false type are asked. Suppose a student tosses a fair coin to determine his answer to each question. If the com falls heads, he answers "true1; if it falls tails, he answers "false1. Find the probability that he gives at least two correct answers