Question: From a bacterial suspension containing 1,000 total bacteria per ml., 0.1 ml. spread onto a plate …

From a bacterial suspension containing 1,000 total bacteria per
ml., 0.1 ml. spread onto a plate produces 20 colonies. 0.2 ml.
produces 40 colonies, and a 1.0 ml. pour plate produces 400
colonies. The suspension has ____% viability.

You spread 0.1 ml. from a suspension containing 10,000 total
bacteria per ml. onto a petri dish and observe 100 colonies after
incubation overnight. The suspension has ____ percent
viability.