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Hi
Standard Normal Curve: μ = 0 and σ = 1
one standard deviation from the mean accounts for about 68.2% of the set *****
two standard deviations from the mean account for about 95.4%
and three standard deviations from the mean account for about 99.7%.
Important to Understand z -values as they relate to the Standard Normal curve:
Wish You the Best in your Studies.