The results show 3 positives
for the first set of tubes, 2 for the second and 1 for the last,
the 3-2-1 combination matches with the MPN value of 150. The
starting dilution was 10-3, therefore the most probable
number/100 ml of sample is 1.5 x 105.
Brown, E. and J. Braddock.
"Sheen screen, a miniaturized most-probable-number method
for enumeration of oil-degrading microorgaaniams." Applied
and Environmental Microbiology 56(12):3895-3896, Dec. 1990.