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Grace has flipped a coin 500 times and each time is has come up tails. If she flips the coin 500 more times, how many tails should she expect? Why?

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Hillary

  1. prob(tails) = 1/2

    so if the coin is "fair", and the coin has no memory chip build in to know what has happened before,
    expected tails = (1/2)(500) = 250

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    Reiny

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