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How do you solve for E(x^2) because you have to know that in order to solve for E(Y^2)? | How do you solve for E(x^2) because you have to know that in order to solve for E(Y^2)? | ||
| + | |||
| + | Remember that Var(x) = E(x^2) - m^2 | ||
| + | So...E(x^2) = Var(x)+ m^2 | ||
| + | Since you have both Var(x) and m (mean) you can solve for E(Y^2). | ||
| + | Now maybe you can help me with problem 8. | ||
| + | |||
| + | Problem 8) | ||
| + | |||
| + | We are given that it is a Poisson R.V. but the a and b that are given are decimals (.2 and 4.2 respectively). Can you just assume that we only need to evaluate from 1 to 4 because only the points 1, 2, 3, and 4 fall between those points? | ||
Revision as of 16:26, 3 March 2009
Note error in question 4 book problem 4.9
it should read X=2 * sin (z/4)
Problem 1)
How do you solve for E(x^2) because you have to know that in order to solve for E(Y^2)?
Remember that Var(x) = E(x^2) - m^2 So...E(x^2) = Var(x)+ m^2 Since you have both Var(x) and m (mean) you can solve for E(Y^2). Now maybe you can help me with problem 8.
Problem 8)
We are given that it is a Poisson R.V. but the a and b that are given are decimals (.2 and 4.2 respectively). Can you just assume that we only need to evaluate from 1 to 4 because only the points 1, 2, 3, and 4 fall between those points?
