A colony of bacteria starts with 2000 individuals. The colony is exposed to a new penicillin-type antibacterial agent. The graph shows the number of bacteria still alive t minutes after exposure. 2000 1500 1000 500 20 40 60 80 100 t (min) a) Estimate the average loss rate of the bacteria colony (bac/min) between 20 and 80 min.

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