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Math Help - How good is this score? (Standard deviation problem)

  1. #1
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    How good is this score? (Standard deviation problem)

    The average score for the exam was 100 with a standard deviation of 10. A person takes the exam and scores 121. Assuming that the exam is valid, how good is this score?
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  2. #2
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    Re: How good is this score? (Standard deviation problem)

    are we told anything about the distribution of the results?

    I will assume for now that the results are normally distributed.

    Using this you can give a percentile value which is a way of showing "how good" the score is.
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  3. #3
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    Re: How good is this score? (Standard deviation problem)

    121- 100= 21. 21/10= 2.1. Use a table of the standard normal distribution to determine the probability of a standard score of 2.1.
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