Let the random variables x and y have joint distribution f(x, y) = (2x + y)/30, x = 1,2 ; y = 1,2,3. a)find the marginal pdf's f1(x) of x and f2(y) of y. b)are x and y independent? justify your answer.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

a; x = 0.5

step-by-step explanation:

-10x = -5

x = 0.5