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70 80 90 100 110 120 130 68%- 95% 99.7% CHART 3-7 A Symmetrical, Bell-Shaped Curve Showing the Relationships between the Standard Deviation and the
70 80 90 100 110 120 130 68%- 95% 99.7% CHART 3-7 A Symmetrical, Bell-Shaped Curve Showing the Relationships between the Standard Deviation and the Percentage of Observations 1 Between xbar and xbar - 1s 2 Between xbar -3s and xbar +1s 3 Between xbar +3s and xbar +2s 4 Area beyond xbar +3s 5 Between xbar -2s and xbar +3
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