"fa fa-check"></i><b>9.6.1</b> Mean and standard deviation</a></li>
<li class="chapter" data-level="9.6.2" data-path="ch-centre-and-dispersion.html"><a href="ch-centre-and-dispersion.html#percentages"><i class="fa fa-check"></i><b>9.6.2</b> Percentages</a></li>
</ul></li>
<li class="chapter" data-level="9.7" data-path="ch-centre-and-dispersion.html"><a href="ch-centre-and-dispersion.html#sec:robustefficient"><i class="fa fa-check"></i><b>9.7</b> Making choices</a></li>
<li class="chapter" data-level="9.8" d