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March 30, 2017

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Jack is taking a four-item true-false test. He has no knowledge about the subject of the test and decided to flip a coin to answer the items. What is the probability that he receives a perfect score? What is the probability on a 10-item test?
Answer: 1/16 or 6.25% that he receives a perfect score .
1/1,024 0r .000976562% not likely of a perfect score on the 10-item test.
Is this correct?
Thanks.

  • Math - ,

    Yes, however, this assumes the probabily of true and false answers are equal. On real tests, that is not true.

  • Math - ,

    on the second, you did not covert the correct fraction to percent.

  • Math - ,

    How would I convert the correct fraction on the second answer? Thanks for your help.

  • Math - ,

    Wouldn' the second fraction convert to 9.8%?

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