How to use a z-table

In the following z-table, we are highlighting how to determine the area to the left of z = 2.34. Notice how we separated 2.34 into 2.3 and 0.04. Then, we look for 2.3 in the first column and 0.04 on the first row. The intersection of these two locations in the table will be the p-value to the left of z.

This means that P(z < 2.34) = 0.99036.

In the following z-table, we are highlighting how to determine the area to the left of z = -1.86. Notice how we separated -1.86 into -1.8 and 0.06. Then, we look for -1.8 in the first column and 0.06 on the first row. The intersection of these two locations in the table will be the p-value to the left of z.

This means that P(z < -1.86) = 0.03144.

You can find an unblurry version of the z-table at https://www.math.arizona.edu/~rsims/ma464/standardnormaltable.pdf.

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