![]() The mean for the standard normal distribution is zero, and the standard deviation is one. The positive z score in the z-table represents the area under the bell curve to the right of z. Corresponding values are higher than the mean of the distribution. 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. Use the standard normal distribution table or z table chart to find values on the right of the mean distribution. A z-score is measured in units of the standard deviation. Use the invNorm () Function on a TI-84 Calculator. Use the Percentile to Z-Score Calculator. The standard normal distribution is a normal distribution of standardized values called z-scores. There are three ways to find the z-score that corresponds to a given area under a normal distribution curve 1. Recognize the standard normal probability distribution and apply it appropriately.
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