fix bug in averaging
fix bug in averaging

adamnovak/hgvm-graph-bakeoff-evaluations,BD2KGenomics/hgvm-graph-bakeoff-evalutations,adamnovak/hgvm-graph-bakeoff-evalutations,adamnovak/hgvm-graph-bakeoff-evaluations,glennhickey/hgvm-graph-bakeoff-evalutations,adamnovak/hgvm-graph-bakeoff-evalutations,glennhickey/hgvm-graph-bakeoff-evaluations,BD2KGenomics/hgvm-graph-bakeoff-evalutations,glennhickey/hgvm-graph-bakeoff-evalutations,glennhickey/hgvm-graph-bakeoff-evaluations,adamnovak/hgvm-graph-bakeoff-evaluations,adamnovak/hgvm-graph-bakeoff-evalutations,glennhickey/hgvm-graph-bakeoff-evaluations,glennhickey/hgvm-graph-bakeoff-evalutations,BD2KGenomics/hgvm-graph-bakeoff-evalutations