Fx(x)= 0 , x<1 Fx(x)= (x^2-2x+2)/2 , 1<= x <2 Fx(x)=1, x>=2 calcualtae the variance of x. I drew the graph of this function. it is a mixed distribution with a point-mass at 1. But i dont know how to solve it.....
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Hello, Find the pdf f of this function, by differentiating Then the variance is : (definition of the variance)
Last edited by Moo; May 1st 2009 at 03:22 AM. Reason: just a typo :p
Almost (certainly, not). You're slipping, moo, you need the square. Originally Posted by Moo Hello, Find the pdf f of this function, by differentiating Then the variance is : This is the short cut formula for the variance. The definition is
Last edited by mr fantastic; Apr 30th 2009 at 10:07 PM. Reason: Put in the Red Square (a famous place in Moscow, by the way)
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