![]() 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. ![]() Then we use the left part to identify a row of the table and the right part to identify a column of the table. The standard normal distribution is a normal distribution of standardized values called z-scores. Thus, a z-score of 2.41 becomes 2.4 and 0.01. ![]()
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