drv

[stuck sigil]

How to do 2c 2d 3b@

[stone berry]

2c, for each X values, calculate what Y is

and make a new table for Y and their probabilities

2d, use that table to get E(Y) and Var(Y)

E(Y) = E(aX+b) for part 3b

@stuck sigil

[stuck sigil]

So like this for 2c d

[stone berry]

ye

[stuck sigil]

Then for 3b it would be like 0 = E(a(3)+b)

[stone berry]

right idea, wrong way to write it
0 = aE(X) + b = 3a+b

and gotta do it for Var as well

[stuck sigil]

So E(Y) is 3a+b th en var(y) is 2a^2

How can I solve for a. N b

[stone berry]

ah wait sorry

wait no nvm

what’s Var(X)?

[stuck sigil]

2

[stone berry]

3a+b=0
2a^2 = 2

solve those

[stuck sigil]

So a^2 = 1 then a = +-1 so b could be -3 or 3?

Nvm would be 1 and -3 since a > 0

Thanks for your help a lot tho @stone berry

[stone berry]

Yep

nws

[stuck sigil]

@stone berry could u also help me with the bottom question 😭 I don’t understand mean of relationship of x and z

[stone berry]

Z=3X-1