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1. About ____ % of the area under the curve of the standard normal distribution is...

1. About ____ % of the area under the curve of the standard normal distribution is between z = − 1.863 z = - 1.863 and z = 1.863 z = 1.863 (or within 1.863 standard deviations of the mean).

2. About ____ % of the area under the curve of the standard normal distribution is outside the interval z=[−2.24,2.24]z=[-2.24,2.24] (or beyond 2.24 standard deviations of the mean).

3. About ____ % of the area under the curve of the standard normal distribution is between z=−2.611z=-2.611and z=2.611z=2.611 (or within 2.611 standard deviations of the mean).

4. About ____ % of the area under the curve of the standard normal distribution is outside the interval z=[−1.96,1.96]z=[-1.96,1.96] (or beyond 1.96 standard deviations of the mean).

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