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Math Help - Homework Help Please!!!! (Statistics)

  1. #1
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    Homework Help Please!!!! (Statistics)

    Jim, a talented professor, administers an achievement test to a group of his students. The mean of the distribution of the scores is 40 and the standard deviation is 8. In this distribution, a raw score of 56 would be equivalent to a z-score of:[/B]

    A. +1.0
    B. +2.0
    C. +8.0
    D. +16.0
    Last edited by mr fantastic; March 31st 2010 at 01:44 PM. Reason: Restored deleted question.
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  2. #2
    Super Member Anonymous1's Avatar
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    Well...

    z = \frac{x-\mu}{\sigma}

    z= \frac{56-40}{8} = +2

    So, (b)

    But, more importantly do you know what a z-score is? And why this remarkable fact holds?
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