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  <title id="t">The 68–95–99.7 Rule of the Normal Distribution</title><desc id="d">A bell curve with shaded bands showing that about 68% of scores fall within one standard deviation of the mean, 95% within two, and 99.7% within three.</desc>
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  <text class="ttl" x="32" y="42">The 68–95–99.7 Rule of the Normal Distribution</text>
  <text class="sub" x="32" y="64">Where class scores fall relative to the mean on a bell curve</text>
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class="grid" x1="198" y1="324.6" x2="198" y2="356"/><text class="mut" x="198" y="376" text-anchor="middle">−2σ</text><line class="grid" x1="294" y1="215.3" x2="294" y2="356"/><text class="mut" x="294" y="376" text-anchor="middle">−1σ</text><line class="vline" x1="390" y1="124" x2="390" y2="356"/><text class="mut" x="390" y="376" text-anchor="middle">μ</text><line class="grid" x1="486" y1="215.3" x2="486" y2="356"/><text class="mut" x="486" y="376" text-anchor="middle">+1σ</text><line class="grid" x1="582" y1="324.6" x2="582" y2="356"/><text class="mut" x="582" y="376" text-anchor="middle">+2σ</text><line class="grid" x1="678" y1="353.4" x2="678" y2="356"/><text class="mut" x="678" y="376" text-anchor="middle">+3σ</text><rect class="f1" x="66" y="399" width="16" height="14" rx="3"/><text class="mut" x="90" y="410">±1σ ≈ 68%</text><rect class="f2" x="180.8" y="399" width="16" height="14" rx="3"/><text class="mut" x="204.8" y="410">±2σ ≈ 95%</text><rect class="f3" x="295.6" y="399" width="16" height="14" rx="3"/><text class="mut" x="319.6" y="410">±3σ ≈ 99.7%</text>
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