![]() Therefore, the 10th percentile of the standard normal distribution is -1.28. You can use this Positive Z Score Table to find the values that are right of the mean. Lastly, the negative score represents the corresponding values that are less than the mean. We look to the leftmost of the row and up to the top of the column to find the corresponding z-value. Table entries for z define the area under the standard normal curve to the left of the Z. ![]() We search the body of the tables and find that the closest value to 0.1000 is 0.1003. Since the entries in the Standard Normal Cumulative Probability Table represent the probabilities and they are four-decimal-place numbers, we shall write 0.1 as 0.1000 to remind ourselves that it corresponds to the inside entry of the table. The question is asking for a value to the left of which has an area of 0.1 under the standard normal curve. To find the probability between these two values, subtract the probability of less than 2 from the probability of less than 3.
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