1. By keeping a certain volume of sample at a constant temperature, the number of microorganisms
in the sample was determined depending on time. The table below shows the data. Calculate the
decimal decay time (D value) according to these data.
Duration (min) Number of Microorganisms
1.0 2.00*105
2.0 4.31 *104
4.5 6.32 *103
6.0 2.00 *103
7.5 6.32 *102