Percentage help with standard normal distribution

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If data is normally distributed, approximately what percentage of the data should have a Z-score between -3 and +3?

May 25th, 2015

sd=4.24264

(3 - (-3)) /  4.24264= z 

z=1.4142

convert z into percent becomes

ans= 92.1349

May 25th, 2015

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May 25th, 2015
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May 25th, 2015
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