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hat was the diver's elevation after$\newline$The temperatures in five cities were $3^{\circ} \mathrm{F},-5^{\circ} \mathrm{F}, 7^{\circ} \mathrm{F},-9^{\circ} \mathrm{F}$, and $-13^{\circ} \mathrm{F}$. What was the mean temperature of the five cities? (Write your answer as a decimal).