# pre cal

For a normal curve, what percentage of values falls beyond two standard deviations from the mean?

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asked by bob
1. I think you can easily get your answer here:

http://davidmlane.com/hyperstat/z_table.html

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posted by Steve
2. Read from the following table:

https://www.stat.tamu.edu/~lzhou/stat302/standardnormaltable.pdf

You will see that 2.275% of data falls beyond μ+2σ and another 2.275% of data falls below μ-2σ.

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