Answer and Step-by-step explanation:
(a)
E[XY] = 1/4*0*1 + 1/4*1*0 + 1/4*-1*0 +1/4*0*-1 = 0
(b)
E[X] = 0, E[Y] = 0
Thus, Cov(X,Y) = E[XY] - E[X]E[Y] = 0
So, Var(X + Y) = Var(X) + Var(Y) is True
The answer is Yes
(c) No, the converse is not true
<span> (b - 8) • (2b + 5) I hope it helps</span>
Definitely false. A liquid ounce is much smaller than one cup of the same liquid, let alone two cups of the liquid.
∗ White Chocolate = $4.5 per pound
∗ Gummy Bears = $2.4 per pound
∗ Dark Chocolate $6 per pound
Victor bought;
∗ ⅔ pound White Chocolate
∗ 1/2 pound gummy bears
∗ 1 1/4 pound dark chocolate
∗ ⅔ • 4.5 = 3
∗ 1/2 • 2.4 = 1.2
∗ 5/4 • 6 = 7.5
∗ 3 + 1.2 + 7.5 = 11.7
⋆Victor spent $11.70 on candy⋆
♡´・ᴗ・`♡