Chapter 10, Problem 4CRQ

To determine

To fill: The blank in the statement “A joint probability density function X and Y on D is a/an ______ function $f\left(x,y\right)$ such that ${\displaystyle \underset{D}{\iint }f\left(x,y\right)dA=\_\_\_\_\_\_\_}$. The probability that the observed values of the random variables X and Y lie in a region $R\subset D$ is given by $P\left[\left(X,Y\right)\in R\right]=\_\_\_\_\_\_\_$” with the appropriate answer.