Dice

[lily06]

You have two balanced, six sided dice. The first has 1,3,4,5,6 and 8 spots on its six faces. The second die has 1,2,2,3,3, and 4 spots on its faces.
a) what is the mean # of spots on the up-face when you roll each of these dice?

b) write the probability model for the outcomes when you roll both dice independently.

Can anyone help?

 

[pka]

What have you done to try and work these?

Tell us how one finds the mean is part a.
Recall each side has probability (1/6).

Show what you have done or tell what you don't understand.

 

[lily06]

for the mean I found 2*.5+2*.5= 2 and 1*.25+2*.5+1*.25= 1.5

 

[pka]

How does your textbook define mean?
It should be: sum of the (outcome value)*(outcome probability).
So one in part (a) is (1+3+4+5+6+8)(1/6).
What is the other one?

 

[lily06]

Sorry gave you the mean to the wrong problme, my head is fried with Stats! I will do the other mean!