![]() ![]() ![]() probability the likelihood of an event happening. mean A statistical measurement also known as the average normal distribution an arrangement of a data set in which most values cluster in the middle of the range and the rest taper off symmetrically toward either extreme. 99.7% of the data will fall within three standard deviations of the mean event a set of outcomes of an experiment to which a probability is assigned. 95% of the data will fall within two standard deviations of the mean. 68% of the data will fall within one standard deviation of the mean. NOTE: To get in Microsoft Excel using your z-score, enter the formula =NORMSDIST(-2.625)ĭistribution value range for a variable empirical rule Provides estimate for the spread of data in a normal distribution. ![]() Since that represents ½ of the graph, we subtract our value from 0.5 → 0.5 - 0.495731 The z-table probability runs from 0 to z and -z to 0, so we lookup our valueįrom the table below, we find our value of 0.495731 Using the Normal Distribution, Calculate P(X < 50)įrom the table below, we see that our Z value is = 0.495731 Click here if you already know your z-scoreįirst, we need to calculate a Z-score.
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