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#3 Please help with this question

3. Suppose electric charge is placed on $[0,?)$ such that the charge on $(x,?)$ is $e_{?5x}$ for all $x>0$. Find the cdf $F(x)$, the charge density $f(x)$, and the total charge on the $x$-axis. Which point $x$ has the greatest charge. Explain.

The following integral gives the CDF:F(x)=?0xf(t)dt=?0xe?5xdx?F(x)=[e?5x?5]0x?F(x)=?[e?5x5?e05]?F(x)