To find the expected number of deer in an area of 300 square miles, we first determine the density of deer in the original area sampled.
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The scientist found 200 deer in 10 square miles. The density is calculated as: \[ \text{Density} = \frac{\text{Number of deer}}{\text{Area}} = \frac{200 \text{ deer}}{10 \text{ square miles}} = 20 \text{ deer/square mile} \]
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Now, we can use this density to estimate the number of deer in an area of 300 square miles: \[ \text{Expected number of deer} = \text{Density} \times \text{New Area} = 20 \text{ deer/square mile} \times 300 \text{ square miles} = 6000 \text{ deer} \]
Therefore, the scientist can expect to find 6,000 deer in an area of 300 square miles.
So the correct response is: 6,000 deer