This table gives a probability that a statistic is less than Z (i.e. &0183 &32 STANDARD NORMAL DISTRIBUTION: Table Values Re resent AREA to the LEFT of the Z score. Note that for z = 1, 2, 3, one obtains (after multiplying by 2 to account for the interval) the results f( z) = 0.6827, 0.9545, 0.9974, If X is a random variable from a normal distribution with mean μ and standard deviation σ, its Z-score may be calculated from X by subtracting μ and dividing by the standard deviation:
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