Calculate the N50 statistic of the following sets of contigs from high quality (low error rate) Illumina-based genome assemblies generated using 100X coverage (both assemblies are from bacteria). Assembly A: 0.6 Mb, 0.25 Mb, 2.8 Mb, 0.25 Mb, 2.2 Mb, 1.1 Mb, 0.7 Mb, 2 Mb, 0.9 Mb, 0.75 Mb N50= ? Mb