For any given value of ±z, this unit will calculate the following probabilities, rounded to six decimal places:
•the respective one-tailed probabilities of −z and +z;
•the two-tailed probability of±z;
•and the proportion of the normal distribution falling between −z and +z.

To proceed, enter the value of z in the designated cell and click the «Calculate» button.

z =
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Probabilities P
one-tailed for −z
one-tailed for +z
two-tailed for ±z
area between ±z