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9 February, 10:00

Brian claims that his dog can do single-digit multiplication. He shows the dog 10 cards with simple multiplication problems that are either correct or incorrect. The dog correctly identifies the correctness of the card 7 times out of 10. If the dog were simply guessing, how many would the dog be expected to get correct?

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  1. 9 February, 10:49
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    Best guess.

    0.5 will be the probability

    When 5 of them are correct and 5 of them are incorrect.
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