If we want the probability that the particle's location is in the lower right corner of the unit square that intersects with the region A, then we integrate the joint density function over that po...If we want the probability that the particle's location is in the lower right corner of the unit square that intersects with the region A, then we integrate the joint density function over that portion of A in the unit square, which gives the following probability: Let random variable X denote the proportion of the tank's capacity that is stocked in a given week, and let Y denote the proportion of the tank's capacity that is sold in the same week.
