The mean for the standard normal distribution is zero, and the standard deviation is one. ![]() 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. The sum of the squared z-scores is always equal. A z-score is measured in units of the standard deviation. The graph of the z-score distribution always has the same shape as the original distribution of sample values. Standard Normal Cumulative Probability Table z 0 Cumulative probabilities for NEGATIVE z-values are shown in the following table: z. The standard normal distribution is a normal distribution of standardized values called z-scores. results were obtained by combining pre-discharge serum bilirubin z scores with the partial. ![]() ![]() Recognize the standard normal probability distribution and apply it appropriately Reference standard positive Reference standard negative Total.
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