Question

IMPORTANT: I don't need help with "a". However, I do need help with b&c

IMPORTANT: I understand that there's a walkthrough given bellow. However, I do not understand the walkthrough given for b&c.

Part B

- Why does E(x)+E(y)=2u (2 mew)?

-What is this?: I honestly have no idea what it is. Please explain to me what it is and what its significance is within the problem.

(5

-This may be the same thing as the symbol above, but just in case it isn't I want to ask what is? It's clearly an important part of parts b&c, but I don't know what it is, what it does, how it affects the problem, etc. Please help me understand those things.

-I follow what's going on in the first line of part b, but other than that the rest of the explanation is completely unclear to me. Please give a highly detailed explanation helping me to understand what is going on in each step and how they got the answer. I asked some specific questions, but please include other detailed info to help me understand what's going on. I'm completely lost in the explanation so there's a lot going on I probably don't even know to ask about.

Part C

- I don't understand this explanation at all. Please give a detailed explanation of what's going on in part c and how they found the answer.

IMPORTANT: If you're going to write please make sure your writing is easily readable/highly legible  

Answer 1

a) E (2X)= 2E(X)=24 Var (2x) = 4 Var (X)= 4 [since, Ver (X)=1 given] b) E(X+Y) = E(X)=E(Y) = 24 Var (X+Y) = V(X) + V (Y) +2 (ar(x,y) E 191+2 Pansy Train ) =2(1P) =Pax by standard deviation correlation * SDOBY coefficient betalen X&Y.

c) E(X+Y) = 24 = E(2x) | We just saw, didn't we??). so, me go with V(X+Y)< V(2x) I both of the 2 me ar, 2(110) 54, calculated in the or, Ips 2 prev. photo ]. ar IPSI Now, we know p is always sl. so, Answer is always It's always better,

Hope this helps.