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A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20.

I'm not sure how to do this....please help

  • Stats -

    Z is a standard score in terms of standard deviations from the mean.

    Z = (score-mean)/SD

    SD^2 = Variance

    Calculate SD and insert values into equation above.

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