![]() ![]() Probabilities above the mean are identical to those below it.Ĭolumn (C): In column (C), you see the area under the normal curve from a given z score toward the tail. For this reason, no negative z scores are listed in the table. Locate the z score where the probability toward the tail isįirst things first—the normal distribution is symmetrical. ![]() Z score can be placed in a standard normal distribution whose mean is zero and the standard deviation is 1. It can be used to standardize the population. Hence it is also known as the standard score. Locate the z score where the probability back toward the mean isĬolumn (C): In column (C), you see the area under the normal curve from a given z score toward the tail. Z score is used to compare the scores of different kinds of variables by standardizing the distribution. 1.65 (Look this up as if it were positive.)Ĭolumn (B): In column (B), you see the area under the normal curve from a given z score back toward the mean. ![]() 1.00 (Look this up as if it were positive.) Locate each one in the unit normal table and write down the values you see in columns (B) and (C) across from it. Probabilities above the mean are identical to those below it.Ĭolumn (A): Notice that there are three columns in the unit normal table: (A), (B), and (C). SOLVED: First things first—the normal distribution is symmetrical. ![]()
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