The joint probability distribution of X and Y is given by:
f (x, y) = P(X = x, Y = y)
(a) Find the value of c that makes f(x, y) a valid joint probability density function.
(b) Find P(X > 2,Y < 1).
(c) Find P(X > Y).

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.