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Forums > Engineering Questions and Answers > Puzzles
Question: What is the probability that the penny will fall on heads for a seventh time?
Last Post 11 Apr 2014 06:16 AM by bruno gggg. 8 Replies.
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Author Messages
alec
Basic Member
Basic Member
Posts:167

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24 Mar 2014 12:56 AM

    I throw a penny six times into the air.
    The penny falls six times on "heads".

    I bet a hundred to one that if I throw the penny into the air for a seventh time, it will fall on "heads".

    Question: What is the probability that the penny will fall on heads for a seventh time?
    james
    Basic Member
    Basic Member
    Posts:125

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    25 Mar 2014 12:03 AM
    0.33
    richards
    Basic Member
    Basic Member
    Posts:172

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    26 Mar 2014 04:26 AM
    0.9
    alastair
    Basic Member
    Basic Member
    Posts:132

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    31 Mar 2014 10:53 PM
    2/3
    edu gaspar
    New Member
    New Member
    Posts:80

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    04 Apr 2014 12:58 AM
    1/2
    richie
    Basic Member
    Basic Member
    Posts:171

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    04 Apr 2014 01:07 AM
    1/5
    phil
    Basic Member
    Basic Member
    Posts:133

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    06 Apr 2014 10:36 PM
    1/4
    Mike McGregor
    New Member
    New Member
    Posts:22

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    08 Apr 2014 11:22 PM
    1/2.
    It's always 1/2 no matter what the history.

    The probability of getting heads on the next 7 throws starting from scratch is (1/2)^7
    bruno gggg
    New Member
    New Member
    Posts:63

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    11 Apr 2014 06:16 AM
    0.66
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