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October 29th, 2013, 05:55 AM  #1 
Newbie Joined: Oct 2013 Posts: 6 Thanks: 0  Density income and total income!
Suppose that the density income function is $f(r) = a*exp(r^2)$ with $r \in(0; 10)$ (hundred thousand euros) and $a=exp(10)1$. Assume that the total number of people in this economy is 1 million. Compute the total income in the interval **[5; 7]** (total amount of money in the economy from people earning between $r = 5$ and $r = 7$ (hundred thousands euros).


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density, income, total 
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