Final answer:
To calculate the mean per capita rate of change in the population of griffs during the past 5 years, subtract the initial population from the final population to find the net change in population and then divide this net change by the number of years to find the average rate of change per year.
Step-by-step explanation:
To calculate the mean per capita rate of change in the population of griffs over the past 5 years, we need to find the average rate of change in population per year. First, we need to subtract the initial population from the final population to find the net change in population. Then divide this net change by the number of years to find the average rate of change per year.
Let's use the given data:
Year Population (Gppl) 1 170 2 85 3 37 4 37 5 39
Net change = Final population - Initial population = 39 - 170 = -131
Mean rate of change = Net change / Number of years = -131 / 5 = -26.2
Therefore, the mean per capita rate of change in the population of griffs during the past 5 years is approximately -26.2 Gppl per year.