Exam 3 Study Guide

practice - will go problem by problem solving

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Given the problem:

$$\int \int x{f}_{x,y}(x,y)dxdy$$

OR

$$\int \int x{f}_{x,y}(x,y)dydx$$

Which one is easier?

• which one is going to be one integration

we are also given the following polygon:

Desmos

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28.11

Let $X,Y$ have joint desntiy:

$$f_{X,Y}(x,y)=14e^{-2x-7y}forx>0andy>0,and{f}_{X,Y}(x,y)=0otherwise$$

Find the $E(X)$. Round you answer to two decimal places

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