When two simple linear regression models estimated using the same dependent variable and different independent variables, then

The number of deer that is going to be added in the current year is approximately 30.

The total approximated population of dear in the current year is 850.

To compute:

3.5% ÷ 100 = 0.035

Multiply it by 850.

850 × 0.035 = 29.75 ; but since there is no 0.75 deer, it is then rounded off to 30.

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