A z-score measures exactly how many standard deviations above or below the mean a data point is. Here's the formula for calculating a z-score: Here's the same formula written with symbols:
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Using the z-table below, find the row for 2.1 and the column for 0.03. Intersect that row and column to find the probability: 0.9834. Therefore p ( Z < 2.13) = 0.9834. Noting that