SOLUTION: X 1 2 3 4 Px p 2p 3p 4p question 1. find p 2. E(x) 3. Var (x)=E(x)-[E(x)]²

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Question 1185097: X 1 2 3 4
Px p 2p 3p 4p
question 1. find p 2. E(x) 3. Var (x)=E(x)-[E(x)]²
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!

1. p+%2B+2p+%2B+3p++%2B4p+=+10p+=+1 ===> p=1%2F10

2.

3. Your formula for variance is wrong -- it should be Var%28X%29+=+E%28X%5E2%29-+%28E%28X%29%29%5E2.
Now

===> Var%28X%29+=+10+-+3%5E2+=+1