![]() In contrast, A positive Z-Score shall show that the data point is above the mean or the. Locate the whole number part of the Z score in the leftmost column of the table. A negative Z-Score shall indicate a score below the mean or the average. The mean for the standard normal distribution is zero, and the standard deviation is one. Using the Negative Z Score Table Identify the desired Z score. For example, if the mean of a normal distribution is five and the standard deviation is two, the value 11 is three standard deviations above (or to the right of) the mean. This means that the value 20 is 1.28 standard deviations above the mean. A z-score is measured in units of the standard deviation. Here is how to calculate the z-score: z (X ) / (20 13) / 5.46 1.28. The standard normal distribution is a normal distribution of standardized values called z-scores. Recognize the standard normal probability distribution and apply it appropriately.
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