Refer to the table below, which shows hypothetical data for a cohort of robins. For the age class of 4 years, how many robins are alive?
A) 8
B) 7
C) 5
D) 4
E) 2

Question

Refer to the table below, which shows hypothetical data for a cohort of robins.  For the age class of 4 years, how many robins are alive?
A) 8 
B) 7 
C) 5 
D) 4 
E) 2

Quizplus · Accepted Answer

Looking for the age class 4, we can see that there are 18 robins in that class. However, we also see that in the next age class (5), 13 of those robins have died. Therefore, the number of robins alive in the 4-year age class is 18-13=5.

Refer to the Table Below, Which Shows Hypothetical Data for a Cohort