- #1
adamwitt
- 25
- 0
X ~ Bin(3,p) ... show that E(X) = 3p
Given X ~ Bin(3,p) ... show that E(X) = 3p
Unsure. Possibly...
P(k) = [n! / (k!*(n-k)!)] * (p^k) * (1-p)^(n-k)
E(X) = Expected value of X = Sum[(Probability of X)*(X)]
I have a whole heap of scribble on my paper but none of it is worth typing up because I have no idea how to show this, although it seems like something incredibly simple. I think I am missing something, like a property of Binary distributions or something that could allow me to work out the answer...arghhh
Homework Statement
Given X ~ Bin(3,p) ... show that E(X) = 3p
Homework Equations
Unsure. Possibly...
P(k) = [n! / (k!*(n-k)!)] * (p^k) * (1-p)^(n-k)
E(X) = Expected value of X = Sum[(Probability of X)*(X)]
The Attempt at a Solution
I have a whole heap of scribble on my paper but none of it is worth typing up because I have no idea how to show this, although it seems like something incredibly simple. I think I am missing something, like a property of Binary distributions or something that could allow me to work out the answer...arghhh