cial">::</span><span class="identifier">functional</span><span class="special">::</span><span class="identifier">average</span><span class="special">&lt;</span> <span class="identifier">Weight</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">result_type</span> <a name="boost.accumulators.impl.weighted_tail_quantile__id330053.flo