![]() ![]() The mean for the standard normal distribution is zero, and the standard deviation is one. By construction, the probability P(Z < z) equals the area under the z curve to the left of that particular value z. Step 4: Find the answer using a calculator: (1100 1026) / 209. A standard normal table (also called the unit normal table or z-score table) is a mathematical table for the values of, indicating the values of the cumulative distribution function of the normal distribution. Step 3: Write the standard deviation, into the z-score equation. Step 2: Put the mean,, into the z-score equation. ![]() 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. For this example question the X-value is your SAT score, 1100. A z-score is measured in units of the standard deviation. The standard normal distribution is a normal distribution of standardized values called z-scores. ![]()
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