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**Ross****Guest**

Hope that someone can help.

the probability density function is given by f(x)= 1/48 (x+4), -4 < x < 4

to get the CDF, we have to integrate it in the following way.

F(x) = ∫ 1/48 (t+4) dt, the upper limit is x and the lower limit is -4

can anybody help me integrate it. also the second part of the question says, using the CDF, get the median and the inter-quartile of X. I don't know how to get that either.

Plzzz i need to do this urgently.

Thanks.

**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,319

You've got a wrong problem

Total probability (integral of PDF from -4 to 4) is infinite because ln0=-∞ .

That contradicts the rule that total probability is 1.

**X'(y-Xβ)=0**

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**Ross****Guest**

yeah i have made a mistake here.

my integral should be f(x)= 1/32 (x+4)

I wish that you can help me doing the problem now...

**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,319

CDF(median)=1/2

CDF(lower quatile)=1/4

CDF(upper quatile)=3/4

-you can solve the three using the expression of CDF yourself now:D

*Last edited by George,Y (2006-05-03 02:49:17)*

**X'(y-Xβ)=0**

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