3.51 + 3.39 + 2.13 - 0.42 = 8.61
Divide 8.61 by the number of years (4) in the sample
8.61/4 = 2.15
The average intrinsic rate is:
r = 2.15
Click here for more practice on intrinsic rate calculations
If you would like more specifics on population dynamics consult the outstanding site at the University of Arizona