public double weightedAverageSize() {
      return totalWeight == 0 ? bytes.getAverage() : (weightedBytesSum * 1d / totalWeight);
    }
Returns average raw (not gzipped) tile size in this aggregation, weighted by the {@link TileWeights} instance
provided.

@see #weightedAverageArchivedSize()
planetiler-core/src/main/java/com/onthegomap/planetiler/util/TilesetSummaryStatistics.java