About $\boxed{\phantom{0000}}$ % of the area under the curve of the standard normal distribution is between $z = -2.313$ and $z = 2.313$ (or within 2.313 standard deviations of the mean).
Added by Sergio S.
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313$ and $z = 2.313$. This is equivalent to finding $P(-2.313 < Z < 2.313)$, where $Z$ is a standard normal random variable. Show more…
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