Calculating the Standard Deviation - Anne Gloag's Math Page

For each data value, calculate how many standard deviations the value is away from its mean. Use the formula: value = mean + z (standard deviation); solve for z. z = (value − mean)/standard deviation. Compare the results of this calculation. The number of standard deviations away from the mean is called a "z-score " In symbols, the formulas ... ................
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