mutual exclusivity

[cwes]

[ QUOTE ]
How did you get to 0.05?

[/ QUOTE ]

Of course he is right:

<font class="small">Code:</font><hr /><pre>
| A = 1 | A = 0 |
-------------------------------------------
B = 1 | | | .35
-------------------------------------------
B = 0 | | .2 |
--------------------------------------------
| .5 | | 1.00
</pre><hr />
Now you go ahead and fill in the missing values:
<font class="small">Code:</font><hr /><pre>
| A = 1 | A = 0 |
-------------------------------------------
B = 1 | (3) .05 | | .35
-------------------------------------------
B = 0 | (2) .45 | .20 |(1) .65
--------------------------------------------
| .50 | | 1.00
</pre><hr />

[jkkkk]

[ QUOTE ]
[ QUOTE ]
How did you get to 0.05?

[/ QUOTE ]

Of course he is right:

<font class="small">Code:</font><hr /><pre>
| A = 1 | A = 0 |
-------------------------------------------
B = 1 | | | .35
-------------------------------------------
B = 0 | | .2 |
--------------------------------------------
| .5 | | 1.00
</pre><hr />
Now you go ahead and fill in the missing values:
<font class="small">Code:</font><hr /><pre>
| A = 1 | A = 0 |
-------------------------------------------
B = 1 | (3) .05 | | .35
-------------------------------------------
B = 0 | (2) .45 | .20 |(1) .65
--------------------------------------------
| .50 | | 1.00
</pre><hr />

[/ QUOTE ]

Ok now now explain your calculations, I'm quite lost on this one.

[jkkkk]

I've managed to figure out that you've .35 * .5 - .2

But I don't understand why you've done it this way, if we take .5 and .65 and * them together we get .325 so there is a .125 gap which means they are not mutually exclusive, why do we just - the .2?