The Following Table Shows the Number of Bird Species Found $A$

question 54

Multiple Choice

The following table shows the number of bird species found on an island of area $A$ square miles that is part of a particular Pacific island chain. $$\begin{array} { | l | l | l | l | l | l | } \hline A = \text { area } & 10 & 20 & 30 & 40 & 50 \\\hline \begin{array} { l } W = \text { number } \\\text { of species }\end{array} & 25 & 31 & 36 & 39 & 42 \\\hline\end{array}$$ Calculate the average rate of change in the number of species as the area changes from 20 to 30 square miles.

• A) 0.76 species per square mile
• B) 36 species per square mile
• C) 0.5 species per square mile
• D) None of the above

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