Is something missing here? The top equation does add up correctly. There follows a bunch of white space an an unrelated calculation.
John
a) Variant
P(x=0)=P(0,0)+P(0,1)+P(0,2)=0.27
P(x=1)=P(1,0)+P(1,1)+P(1,2)=0,4
P(x=2)=P(2,0)+P(2,1)+P(2,2)=0.33
expected value ( I do not know how to get this?)
E(x)=0,(27)+1,(4)+2(33)=....
Last edited by Aauusteja; 11-22-2010 at 02:33 PM.
Is something missing here? The top equation does add up correctly. There follows a bunch of white space an an unrelated calculation.
John
Yeah. You really don't specify what's giving you problems.
Ok, I think I know what is confusing you. (In your initial post, you seemed troubled that your calculated expected value was greater than one. Is that the problem?)
After you calculate the expected value, what is it that you know? Or to put it another way, what does the expected value tell you?
I do not know how to calculate it ( how to find) expected value.
Noone do not want to help...
Why are you suspicious of your calculation? That's why I was asking my questions. The answer is right under your nose
E(x)=0,(27)+1,(4)+2,(33)=27/99+13/9+21/9=401/99
It's okay?
Last edited by Aauusteja; 11-23-2010 at 12:49 PM.
Your notation indicates that you are mixing up two systems. I'll write my answer in the North American English fashion.
E(x)=0*(0.27)+1*(0.4)+2*(0.33)=1.06
The idea is that you expect to have 0 sales 27% of the time, 1 sale 40% of the time and 2 sales 33% of the time. For a randomly selected period, you expect 1.06 sales.
Thanks, you realy helped me.
But one more question
Define the chance variable H as the total sales on markets X and Y
How that will look?
P(x,y)=P(1,1)+P(1,2)+P(2,1)+P(2,2)
That isn't a question; it's telling you what H stands for.
Now that I look again, is the posted table complete? or is some information missing?
It's all, nothing isn't missing.
If I good understand
I need to define H e.g all goods sould be sold
So P(x,y)=P(1,1)+P(1,2)+P(2,1)+P(2,2) Can be like this?
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