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Math Help - Coin Toss Model Probability

  1. #1
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    Coin Toss Model Probability

    Hi everybody!

    So being a calc student and a stats student simultaneously is kinda fun, but i think its may be giving me tunnel vision. Argh!! Here's why...

    If an alarm clock has a .5 probability of working, how many alarm clocks are required to reach a .99 probability that at least one will work?

    So calc is blurring this thing for me, because i want to solve it with sum of series tools...which ain't workin'.

    Sooo, what does work?
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  2. #2
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    Quote Originally Posted by boardguy67 View Post
    Hi everybody!
    If an alarm clock has a .5 probability of working, how many alarm clocks are required to reach a .99 probability that at least one will work?
    .99=1-(.5^x)

    x = 6.64 alarm clocks... round up to 7.
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  3. #3
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    Sweet! Thanks Shenanigans! I suspected there was an easy way to do it that i wasn't seeing.
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