This table is also called a z-score table. The table explains that the probability that a standard normal random variable will be less than -1.21 is 0.1131 that is, P (Z < -1.21) 0.1131. Each number on the horizontal line corresponds to the z-score. To find the cumulative probability of a z-score equal to -1.21, cross-reference the row containing -1.2 of the table with the column holding 0.01. The mean for the standard normal distribution is zero, and the standard deviation is one. A standard normal distribution always has a mean of zero and has intervals that increase by 1. 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. Step 3: Intersect the row and column from Steps 1 and 2. Step 2: Go to the column that represents the second digit after the decimal point (the hundredths digit) of your z -value. The standard normal distribution is a normal distribution of standardized values called z-scores. Step 1: Go to the row that represents the ones digit and the first digit after the decimal point (the tenths digit) of your z -value. Recognize the standard normal probability distribution and apply it appropriately.
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