In Figure 5.11a,how many years pass for a cohort before greater than 50 percent of the cohort is lost?
A) More than 5 years
B) More than 10 years
C) Less than 1 year
D) Less than 5 years

Question

In Figure 5.11a,how many years pass for a cohort before greater than 50 percent of the cohort is lost? 
A) More than 5 years 
B) More than 10 years 
C) Less than 1 year 
D) Less than 5 years

Quizplus · Accepted Answer

By looking at the graph, it seems that after around 2-3 years, more than 50% of the cohort is lost. However, upon closer inspection, we can see that the y-axis is not linear and is instead on a logarithmic scale. This means that the percentage of the cohort lost is dropping at an exponential rate, and it takes longer than it appears to reach over 50% loss. Based on the graph, it seems that it takes around 4-5 years for the cohort to reach over 50% loss, so the best answer is D, less than 5 years.