probability of coin toss, please help :)

  • This topic has 2 replies, 3 voices, and was last updated 10 years ago by Rap.
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    • #14405

      if 2 coins are tossed 20 times, how many of those tosses would you expect to result in both coins landing heads up? show your calculations.

      my attempt:

      for each toss the probability of heads is 0.5
      therefore the probability of heads for both coins is 0.5 * 0.5 = 0.25

      5/20 times the coins will both be heads up.

      is this all correct? any help would be appreciated. thanks

    • #103274

      seems fine to me

      why are there so many math questions now? 🙄

    • #103297

      5 is the average number of times two heads will turn up. It is possible for anything from zero to 20 to happen though.

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