![]() ![]() ![]() 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. A z-score is measured in units of the standard deviation. Table 1: Table of the Standard Normal Cumulative Distribution Function (z) z. What is a Z Table: Standard Normal Probability. ![]() The standard normal distribution is a normal distribution of standardized values called z-scores. The z-table helps by telling us what percentage is under the curve at any particular point. Recognize the standard normal probability distribution and apply it appropriately. ![]()
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