Two forecasting models were used to predict the future values of a time series.The forecasts are shown below with the actual values. 
Calculate the mean squared deviation (MSD)for Model 2
Definitions:
Zero Population Growth
Point at which the birth rate equals the death rate. A population with zero population growth does not change in size.
Increase
A rise or growth in quantity, size, intensity, or some other measure.
Population Density
The number of individuals of a species per unit of area or volume at a given time.
Individuals
Separate and distinct organisms or entities, often used in the context of discussing a single member of a species.
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