Probability Tree Diagram Problem

[Gee]

Let's say buying a pizza in week 1 is 0.7 and consequently buying a pizza in week 2 is 0.4

If they ask for the probability in buying a pizza in week 1 but not in week 2 is it just 0.4? Or 0.28 (0.7 x 0.4)?

I'll attach a picture to make it easier to understand but I'm not too sure if it's clear.


And any help would be much appreciated

 

[soroban]

Hello, Gee!

Let's say buying a pizza in week 1 is 0.7 and consequently buying a pizza in week 2 is 0.4

If they ask for the probability in buying a pizza in week 1 but not in week 2,
. . is it just 0.4? Or 0.28 (0.7 x 0.4)? .What?

I'll attach a picture to make it easier to understand but I'm not too sure if it's clear.

View attachment 1326
And any help would be much appreciated.

You should label your diagram more carefully . . .


\(\displaystyle \begin{array}{ccccccc} &&& \text{Wk1} && \text{Wk2} \\ \\ &&&&& \boxed{pizza} \\ &&&&0.4 \\ &&& \boxed{pizza} \\ && 0.7 && 0.6 \\ &&&&& \boxed{\text{not}} \\ \boxed{*} \\ & &&&& \boxed{\text{pizza}} \\ && 0.3 && 0.4 \\ &&& \boxed{\text{not}} \\ &&&& 0.6 \\ &&&&& \boxed{\text{not}} \end{array}\)