The extent of disease transmission can be affected greatly by the viability of ­infectious organisms suspended in the air. Because of the infectious nature of the disease under study, the viability of these organisms must be studied in an airtight chamber. One way to do this is to disperse an aerosol cloud, prepared from a solution containing the ­organisms, into the chamber. The biological recovery at any particular time is the ­percentage of the total number of organisms suspended in the aerosol that are viable. The data in the accompanying table are the biological recovery percentages computed from 13 different aerosol clouds. For each of the clouds, recovery percentages were ­determined at different times.
a. Plot the data.
b. Since there is some curvature, try to linearize the data using the log of the ­biological recovery.

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Cloud Time,r (in minutes) Biological Recovery (%) 1 70.6 5 52.0 3 10 33.4 4 15 22.0 5 20 18.3 25 15.1 7. 30 13.0 8 35 10.0 40 9.1 10 45 8.3 11 50 7.9 12 55 7.7 13 60 7.7