Use the following to answer questions:
Suppose that of 300 mice in a mice colony born in January, 150 are still alive at the start of September, and 120 are still alive at the start of October.
-What is the mortality rate during the month of September?
A) 0.15
B) 0.20
C) 0.30
D) 0.50
E) 0.80

Question

Quizplus · Accepted Answer

The mortality rate during September can be calculated by subtracting the number of mice alive at the start of September from the number of mice alive at the start of October, and then dividing by the number of mice alive at the start of September:

(120 - 150)/150 = -0.2

However, since mortality rates are typically expressed as a positive number, we take the absolute value:

|-0.2| = 0.2

Therefore, the mortality rate during September is 0.20 or 20%.

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