Bell Curve: 68-95-99 Rule
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![](https://www.mathguide.com/lessons3/Statistics/bc-68percent.gif)
Where did the empirical formula for normal distribution come from
![](https://image3.slideserve.com/6601990/the-68-95-99-7-rule3-l.jpg)
PPT - The 68-95-99.7% Rule and z-scores PowerPoint Presentation
![](https://www.coursehero.com/thumb/62/96/629655c120b743b45494fb8c3a805c7ae8047ab6_180.jpg)
AP Psych, Module 38.pdf - MODULE 38: ASSESSING INTELLIGENCE Isabella Santa Period 4 KEY POINTS ○ Early and Modern Tests of Mental Abilities ○ Francis
![](https://mathcracker.com/images/legacy/normal-distribution-tutorial.png)
Empirical Rule Calculator
![](https://www.mathguide.com/lessons3/Statistics/sd-nurse.jpg)
Standard Deviation
![](https://mathspace-production-media.mathspace.co/media/upload/images/10-data-analysis/7773.png)
68-95-99.7 Rule (empirical rule), NCEA Level 2 Maths
![](https://blogs.sas.com/content/iml/files/2017/04/interval4.png)
Visualize the 68-95-99.7 rule in SAS - The DO Loop
![](https://www.mathguide.com/lessons3/Statistics/ft04.gif)
Frequency Tables
![](https://mathbooks.unl.edu/Contemporary/images/68-95-99.png)
CM The Normal Distribution Part I
![](https://jonathanweisberg.org/vip/_main_files/figure-html/snnrule-1.png)
19 Significance Testing