The z-Table
The z-Table
The following z-Table indicates the area to the right of the vertical centre-line of the z-curve (or standard normal curve) for different standard deviations.
Example
The green shaded area in the diagram below represents 1.45 standard deviations from the mean (which is 0). The area of this shaded portion is 0.4265 (or 42.65% of the total area under the curve).
To get this area, we read down the left side of the table for the standard deviation's first 2 digits (the whole number and the first number after the decimal point, in this case 1.4), then we read across the table for the "0.05" part (the top row represents the 2nd decimal place of the standard deviation that we are interested in.)
|z |0.00 |
|4.753 |0.499999 |
|5.199 |0.4999999 |
|5.612 |0.49999999 |
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