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    Distribution of IQ scores and standard deviation

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    1.) Test one: mean is 80 and standard deviation is 9. Mark scores 91

    Test two: mean is 77 and standard deviation is 6. Mark score 87

    Find the percentile for all

    Which test Mark did better? Why?

    2.) What is the the standard deviation for IQ tests? If someone's IQ is 140, how many standard deviation is it above the mean?

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    Solution Preview

    The percentile can be calculated from a standard normal distribution table.

    You can find one here: ...

    Solution Summary

    This solution helps explore the following questions:
    How to compare distributions with different standard deviations?
    How to compute standard deviation for IQ scores?