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Probability

Short Answer Type

1031. A coin is tossed 6 times. What is the probability of getting at least two heads?

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1032. A coin is tossed 6 times. What is the probability of getting at least four heads?

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1033. A coin is tossed 5 times. What is the probabilities of obtaining at least 2 tails?

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1034. A fair coin is tossed 7 times. Find the probability of obtaining at least 5 tails.

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1035. A coin is tossed 3 times. Find the probability of at least two heads.

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1036. A die is thrown 5 times. If getting an odd number is success, find the probability of getting at least 4 successes.

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1037. A die is thrown 6 times. If getting an odd number is a success, what is the probability of at least 5 successes?

Here n = 6
Let p be the probability of getting an odd number

space space therefore space space space straight p space equals space straight p left parenthesis 1 comma space 3 comma space 5 right parenthesis space equals space 3 over 6 equals space 1 half comma space space straight q space equals space 1 minus straight p space equals space 1 minus 1 half space equals 1 half

P(at least 5 successes) = P(5) + P(6)

equals space straight C presuperscript 6 subscript 5 space open parentheses 1 half close parentheses to the power of 1 space open parentheses 1 half close parentheses to the power of 5 plus space straight C presuperscript 6 subscript 6 space open parentheses 1 half close parentheses to the power of 6 space equals space open parentheses 1 half close parentheses to the power of 6 space open square brackets straight C presuperscript 6 subscript 5 plus straight C presuperscript 6 subscript 6 close square brackets equals space 1 over 64 left parenthesis 6 plus 1 right parenthesis space equals space 7 over 64

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1038. A die is thrown 6 times. Getting a number greater than 4 is considered a success. Find the probability of at least two successes.

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1039. An unbiased die is thrown 3 times. If getting a 2 or 5 is considered a success, find the probability of at least 2 successes.

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1040. Five dice are thrown simultaneously. If the occurrence of 3, 4 or 5 in a single die is considered a success, find the probability of at least three successes.

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