1. ## Finding expected value

Can anyone help me to solve part C of this question. I got stuck and really don't know how to find the expected value of the price.

Thank you

2. ## Re: urgent help-expected value

Do you know the definition of EV (expected value)? The best way to deal with this is to say that total price for the breakfast is $\displaystyle Z=X+Y$ where X is the cost of the sandwich and Y is the cost of the drink. Then you can calculate the EV of the whole meal as follows: $\displaystyle E(Z)=E(X+Y)=E(X)+E(Y)$

For Y you have:
$\displaystyle P(Y=0)=2/3$
$\displaystyle P(Y=2)=1/3$

$\displaystyle E(Y)=0*2/3 + 2 * 1/3 = 2/3$

3. ## Re: urgent help-expected value

1/9(12+12+14+14+14+16+15+15+17)=43/3

4. ## Re: urgent help-expected value

This is obviously homework, so you shouldn't provide the entire solution.

5. ## Re: urgent help-expected value

This is not my homework. This is my exam question which i can't do it.
So which one is the right solution, Duke or you?
I don't understand expected value because my teacher never teach us about it.