An environmental scientist obtains a sample of water from an irrigation canal that contains a certain type of bacteria at a concentration of 5 per milliliter. Find the mean number of bacteria in a 4-milliliter sample.
A)2.2
B)4.5
C)20
D)5

Question

Quizplus · Accepted Answer

The mean number of bacteria in a 4-milliliter sample is calculated by multiplying the concentration of bacteria per milliliter by the volume of the sample. Since the concentration is 5 bacteria per milliliter, for a 4-milliliter sample, the mean number of bacteria is 5 bacteria/mL * 4 mL = 20 bacteria.

An Environmental Scientist Obtains a Sample of Water from an Irrigation