standard deviation

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the mean is 3.5. dtandard deviation is .5. sally's score is 1.5 on test. how many standard deviations is she from the mean?
billy scores 5. what is his standard score?
what scale of measurement is being used? is it appropriate? why/why not?

  • standard deviation -

    The Z score indicates standard deviations from the mean. It is accurate as long as the distribution is normal.

    Z = (score - mean)/standard deviation

    You can do the calculations.

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