- #1
Dafydd
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Homework Statement
Problem description:
A variable X has expected value 0.002 in meters. Consider X - 0.002, scale to millimeter, and we get Y.
Tasks:
a) Express Y as a function of X
b) Relate the probability distributions FX and FY
c) Relate the probability density functions fX and fY
Homework Equations
[tex] F(x) = \operatorname P ( X \leq x ) = \int_{-\infty}^x f(t) \, \mathrm{d}t [/tex]
[tex] \int_{-\infty}^{\infty} f(x) \, \mathrm{d}x = 1[/tex]
[tex] f(x) = F'(x) \geq 0 [/tex]
The Attempt at a Solution
a) Y = 1000X - 2
(I think)
b) I have no clue. I mean, I could make a wild guess, but I don't see any reason to.
c) I suppose we get fX and fY by differentiating FX and FY... somehow.
I also don't really know what it means to "relate" these things. Is it to express the one in terms of the other, so that for example if a*b = c then relating a to b I either say that a = c/b or that b = c/a? Or what?
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