Answer:
1
Explanation:
You want the standard deviation of a normal distribution.
Normal distribution
The "standard normal distribution" is defined to have a mean of 0 and a standard deviation of 1.
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Additional comment
The standard distribution is often shifted and scaled to have some other particular mean and standard deviation. The computation of a "Z-score" is a way to relate a value in the scaled distribution back to the characteristics of the standard normal distribution. The Z-score is the number of standard deviations a value is from the mean.