\BeginKnitrBlock{exercise}\iffalse{-91-84-104-101-32-109-101-97-110-93-}\fi{}<div class="exercise"><span class="exercise" id="exr:unnamed-chunk-25"><strong>(\#exr:unnamed-chunk-25)  \iffalse (The mean) \fi{} </strong></span>What's the mean for eye sight in Table \@ref(tab:dataexcerpt)? What's the mean for nose colour?</div>\EndKnitrBlock{exercise}