# Let X, Y have joint density fX,Y(x, y) = 14e-2x-7y for x > 0 and y > 0; and fX,Y(x,y) = 0 otherwise. Find the variance of the sum of X and y, i.e., find Var (X + Y).

Let X, Y have joint density fX,Y(x, y) = 14e-2x-7y for x > 0 and y > 0; and fX,Y(x,y) = 0 otherwise. Find the variance of the sum of X and y, i.e., find Var (X + Y).

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**Related Book For**

## Introduction to Probability

1st edition

**Authors:** Mark Daniel Ward, Ellen Gundlach

**ISBN:** 978-0716771098